initial release

diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644 (file)
index 0000000..68048de
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,82 @@
+{
+  "env": {
+    "browser": false,
+    "es6": true,
+    "node": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:node/recommended",
+    "plugin:security/recommended",
+    "plugin:sonarjs/recommended"
+  ],
+  "parserOptions": {
+    "ecmaVersion": 2018
+  },
+  "plugins": [
+    "node",
+    "security",
+    "sonarjs"
+  ],
+  "rules": {
+    "array-element-newline": [
+      "error",
+      "consistent"
+    ],
+    "arrow-parens": [
+      "error",
+      "always"
+    ],
+    "arrow-spacing": [
+      "error",
+      {
+        "after": true,
+        "before": true
+      }
+    ],
+    "block-scoped-var": "error",
+    "block-spacing": "error",
+    "brace-style": "error",
+    "callback-return": "error",
+    "camelcase": "error",
+    "class-methods-use-this": "error",
+    "comma-dangle": [
+      "error",
+      "always-multiline"
+    ],
+    "comma-spacing": [
+      "error",
+      {
+        "after": true,
+        "before": false
+      }
+    ],
+    "comma-style": [
+      "error",
+      "last"
+    ],
+    "sonarjs/cognitive-complexity": "warn",
+    "sonarjs/no-duplicate-string": "warn",
+    "keyword-spacing": "error",
+    "linebreak-style": [
+      "error",
+      "unix"
+    ],
+    "no-unused-vars": [
+      "error", {
+        "varsIgnorePattern": "^_"
+      }
+    ],
+    "object-curly-spacing": [
+      "error",
+      "always"
+    ],
+    "prefer-const": "error",
+    "quotes": [
+      "warn",
+      "single"
+    ],
+    "strict": "error",
+    "vars-on-top": "error"
+  }
+}

diff --git a/.gitignore b/.gitignore
new file mode 100644 (file)
index 0000000..349ed65
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+node_modules
+.nyc_output
+coverage
+.vscode

diff --git a/.nycrc.json b/.nycrc.json
new file mode 100644 (file)
index 0000000..497d8af
--- /dev/null
+++ b/.nycrc.json
@@ -0,0 +1,6 @@
+{
+  "reporter": [
+    "lcov",
+    "text"
+  ]
+}

diff --git a/README.md b/README.md
new file mode 100644 (file)
index 0000000..b332bc4
--- /dev/null
+++ b/README.md
@@ -0,0 +1,9 @@
+# An RFC8288 Parsing Library
+
+## What
+
+This is a minimal parser for HTTP Link Headers, basically just a wrapper around a PEG grammar.
+
+## Notes
+
+After updating the grammar, `npm run generate` will compile the parser.

diff --git a/index.js b/index.js
new file mode 100644 (file)
index 0000000..8b9255d
--- /dev/null
+++ b/index.js
@@ -0,0 +1,8 @@
+'use strict';
+
+const { parse, SyntaxError } = require('./lib/rfc8288-web-linking');
+
+module.exports = {
+  parse,
+  SyntaxError,
+};

diff --git a/lib/rfc8288-web-linking.js b/lib/rfc8288-web-linking.js
new file mode 100644 (file)
index 0000000..3c41f32
--- /dev/null
+++ b/lib/rfc8288-web-linking.js
@@ -0,0 +1,1070 @@
+// Generated by Peggy 1.2.0.
+//
+// https://peggyjs.org/
+
+"use strict";
+
+
+/* Generated code is not pretty, ignore a lot of this horrorstyle. */
+/* eslint-disable quotes */
+/* eslint-disable vars-on-top */
+/* eslint-disable no-control-regex */
+/* eslint-disable security/detect-object-injection */
+/* eslint-disable vars-on-top */
+/* eslint-disable brace-style */
+/* eslint-disable comma-dangle */
+/* eslint-disable no-unused-vars */
+
+function makeString(o) {
+  return o.join('');
+}
+
+const onlyFirstAttributes = [
+  'media',
+  'rel',
+  'title',
+  'title*',
+  'type',
+];
+
+
+
+function peg$subclass(child, parent) {
+  function C() { this.constructor = child; }
+  C.prototype = parent.prototype;
+  child.prototype = new C();
+}
+
+function peg$SyntaxError(message, expected, found, location) {
+  var self = Error.call(this, message);
+  if (Object.setPrototypeOf) {
+    Object.setPrototypeOf(self, peg$SyntaxError.prototype);
+  }
+  self.expected = expected;
+  self.found = found;
+  self.location = location;
+  self.name = "SyntaxError";
+  return self;
+}
+
+peg$subclass(peg$SyntaxError, Error);
+
+function peg$padEnd(str, targetLength, padString) {
+  padString = padString || " ";
+  if (str.length > targetLength) { return str; }
+  targetLength -= str.length;
+  padString += padString.repeat(targetLength);
+  return str + padString.slice(0, targetLength);
+}
+
+peg$SyntaxError.prototype.format = function(sources) {
+  var str = "Error: " + this.message;
+  if (this.location) {
+    var src = null;
+    var k;
+    for (k = 0; k < sources.length; k++) {
+      if (sources[k].source === this.location.source) {
+        src = sources[k].text.split(/\r\n|\n|\r/g);
+        break;
+      }
+    }
+    var s = this.location.start;
+    var loc = this.location.source + ":" + s.line + ":" + s.column;
+    if (src) {
+      var e = this.location.end;
+      var filler = peg$padEnd("", s.line.toString().length);
+      var line = src[s.line - 1];
+      var last = s.line === e.line ? e.column : line.length + 1;
+      str += "\n --> " + loc + "\n"
+          + filler + " |\n"
+          + s.line + " | " + line + "\n"
+          + filler + " | " + peg$padEnd("", s.column - 1)
+          + peg$padEnd("", last - s.column, "^");
+    } else {
+      str += "\n at " + loc;
+    }
+  }
+  return str;
+};
+
+peg$SyntaxError.buildMessage = function(expected, found) {
+  var DESCRIBE_EXPECTATION_FNS = {
+    literal: function(expectation) {
+      return "\"" + literalEscape(expectation.text) + "\"";
+    },
+
+    class: function(expectation) {
+      var escapedParts = expectation.parts.map(function(part) {
+        return Array.isArray(part)
+          ? classEscape(part[0]) + "-" + classEscape(part[1])
+          : classEscape(part);
+      });
+
+      return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
+    },
+
+    any: function() {
+      return "any character";
+    },
+
+    end: function() {
+      return "end of input";
+    },
+
+    other: function(expectation) {
+      return expectation.description;
+    }
+  };
+
+  function hex(ch) {
+    return ch.charCodeAt(0).toString(16).toUpperCase();
+  }
+
+  function literalEscape(s) {
+    return s
+      .replace(/\\/g, "\\\\")
+      .replace(/"/g,  "\\\"")
+      .replace(/\0/g, "\\0")
+      .replace(/\t/g, "\\t")
+      .replace(/\n/g, "\\n")
+      .replace(/\r/g, "\\r")
+      .replace(/[\x00-\x0F]/g,          function(ch) { return "\\x0" + hex(ch); })
+      .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return "\\x"  + hex(ch); });
+  }
+
+  function classEscape(s) {
+    return s
+      .replace(/\\/g, "\\\\")
+      .replace(/\]/g, "\\]")
+      .replace(/\^/g, "\\^")
+      .replace(/-/g,  "\\-")
+      .replace(/\0/g, "\\0")
+      .replace(/\t/g, "\\t")
+      .replace(/\n/g, "\\n")
+      .replace(/\r/g, "\\r")
+      .replace(/[\x00-\x0F]/g,          function(ch) { return "\\x0" + hex(ch); })
+      .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return "\\x"  + hex(ch); });
+  }
+
+  function describeExpectation(expectation) {
+    return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
+  }
+
+  function describeExpected(expected) {
+    var descriptions = expected.map(describeExpectation);
+    var i, j;
+
+    descriptions.sort();
+
+    if (descriptions.length > 0) {
+      for (i = 1, j = 1; i < descriptions.length; i++) {
+        if (descriptions[i - 1] !== descriptions[i]) {
+          descriptions[j] = descriptions[i];
+          j++;
+        }
+      }
+      descriptions.length = j;
+    }
+
+    switch (descriptions.length) {
+      case 1:
+        return descriptions[0];
+
+      case 2:
+        return descriptions[0] + " or " + descriptions[1];
+
+      default:
+        return descriptions.slice(0, -1).join(", ")
+          + ", or "
+          + descriptions[descriptions.length - 1];
+    }
+  }
+
+  function describeFound(found) {
+    return found ? "\"" + literalEscape(found) + "\"" : "end of input";
+  }
+
+  return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
+};
+
+function peg$parse(input, options) {
+  options = options !== undefined ? options : {};
+
+  var peg$FAILED = {};
+  var peg$source = options.grammarSource;
+
+  var peg$startRuleFunctions = { links: peg$parselinks, extendedValue: peg$parseextendedValue };
+  var peg$startRuleFunction = peg$parselinks;
+
+  var peg$c0 = ",";
+  var peg$c1 = "<";
+  var peg$c2 = ">";
+  var peg$c3 = ";";
+  var peg$c4 = "=";
+  var peg$c5 = "*";
+
+  var peg$r0 = /^[^>]/;
+  var peg$r1 = /^[a-zA-Z]/;
+  var peg$r2 = /^["]/;
+  var peg$r3 = /^[^"]/;
+  var peg$r4 = /^[^";,]/;
+  var peg$r5 = /^[ ]/;
+  var peg$r6 = /^[^']/;
+  var peg$r7 = /^[']/;
+
+  var peg$e0 = peg$otherExpectation("links");
+  var peg$e1 = peg$otherExpectation("link-value");
+  var peg$e2 = peg$literalExpectation(",", false);
+  var peg$e3 = peg$otherExpectation("uri-reference");
+  var peg$e4 = peg$literalExpectation("<", false);
+  var peg$e5 = peg$literalExpectation(">", false);
+  var peg$e6 = peg$literalExpectation(";", false);
+  var peg$e7 = peg$otherExpectation("uri");
+  var peg$e8 = peg$classExpectation([">"], true, false);
+  var peg$e9 = peg$otherExpectation("attributes");
+  var peg$e10 = peg$otherExpectation("link-param");
+  var peg$e11 = peg$literalExpectation("=", false);
+  var peg$e12 = peg$otherExpectation("name");
+  var peg$e13 = peg$classExpectation([["a", "z"], ["A", "Z"]], false, false);
+  var peg$e14 = peg$literalExpectation("*", false);
+  var peg$e15 = peg$otherExpectation("value");
+  var peg$e16 = peg$classExpectation(["\""], false, false);
+  var peg$e17 = peg$classExpectation(["\""], true, false);
+  var peg$e18 = peg$classExpectation(["\"", ";", ","], true, false);
+  var peg$e19 = peg$otherExpectation("whitespace");
+  var peg$e20 = peg$classExpectation([" "], false, false);
+  var peg$e21 = peg$otherExpectation("bad whitespace");
+  var peg$e22 = peg$otherExpectation("extended-value");
+  var peg$e23 = peg$classExpectation(["'"], true, false);
+  var peg$e24 = peg$classExpectation(["'"], false, false);
+  var peg$e25 = peg$anyExpectation();
+
+  var peg$f0 = function(links) {
+      return links;
+    };
+  var peg$f1 = function(uriReference, attributes) {
+      seenAttributes = [];
+      return {
+        target: uriReference,
+        attributes,
+      };
+    };
+  var peg$f2 = function(uri) { 
+      return uri;
+    };
+  var peg$f3 = function(uri) {
+      return makeString(uri);
+    };
+  var peg$f4 = function(attrs) {
+      return attrs.filter((a) => a);
+    };
+  var peg$f5 = function(name, value) {
+      if (onlyFirstAttributes.includes(name.name)) {
+        if (seenAttributes.includes(name.name)) {
+          // Repeat of singleton attribute, ignore it.
+          return;
+        }
+        seenAttributes.push(name.name);
+      }
+      return {
+        ...name,
+        ...value,
+      };
+    };
+  var peg$f6 = function(name) {
+      return {
+        ...name,
+        value: null,
+      }
+    };
+  var peg$f7 = function(name, extended) {
+      return {
+        name: makeString(name.concat(extended)).toLowerCase(),
+        extended: !!extended,
+      };
+    };
+  var peg$f8 = function(value) {
+      return {
+        value: makeString(value),
+      };
+    };
+  var peg$f9 = function(encoding, language, value) {
+      return {
+        encoding: encoding.length ? makeString(encoding) : 'UTF-8',
+        language: language.length ? makeString(language) : null,
+        value: decodeURIComponent(makeString(value)),
+      };
+    };
+  var peg$f10 = function(value) {
+      return {
+        encoding: null,
+        language: null,
+        value: makeString(value),
+      };
+    };
+
+  var peg$currPos = 0;
+  var peg$savedPos = 0;
+  var peg$posDetailsCache = [{ line: 1, column: 1 }];
+  var peg$maxFailPos = 0;
+  var peg$maxFailExpected = [];
+  var peg$silentFails = 0;
+
+  var peg$result;
+
+  if ("startRule" in options) {
+    if (!(options.startRule in peg$startRuleFunctions)) {
+      throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
+    }
+
+    peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
+  }
+
+  function text() {
+    return input.substring(peg$savedPos, peg$currPos);
+  }
+
+  function offset() {
+    return peg$savedPos;
+  }
+
+  function range() {
+    return {
+      source: peg$source,
+      start: peg$savedPos,
+      end: peg$currPos
+    };
+  }
+
+  function location() {
+    return peg$computeLocation(peg$savedPos, peg$currPos);
+  }
+
+  function expected(description, location) {
+    location = location !== undefined
+      ? location
+      : peg$computeLocation(peg$savedPos, peg$currPos);
+
+    throw peg$buildStructuredError(
+      [peg$otherExpectation(description)],
+      input.substring(peg$savedPos, peg$currPos),
+      location
+    );
+  }
+
+  function error(message, location) {
+    location = location !== undefined
+      ? location
+      : peg$computeLocation(peg$savedPos, peg$currPos);
+
+    throw peg$buildSimpleError(message, location);
+  }
+
+  function peg$literalExpectation(text, ignoreCase) {
+    return { type: "literal", text: text, ignoreCase: ignoreCase };
+  }
+
+  function peg$classExpectation(parts, inverted, ignoreCase) {
+    return { type: "class", parts: parts, inverted: inverted, ignoreCase: ignoreCase };
+  }
+
+  function peg$anyExpectation() {
+    return { type: "any" };
+  }
+
+  function peg$endExpectation() {
+    return { type: "end" };
+  }
+
+  function peg$otherExpectation(description) {
+    return { type: "other", description: description };
+  }
+
+  function peg$computePosDetails(pos) {
+    var details = peg$posDetailsCache[pos];
+    var p;
+
+    if (details) {
+      return details;
+    } else {
+      p = pos - 1;
+      while (!peg$posDetailsCache[p]) {
+        p--;
+      }
+
+      details = peg$posDetailsCache[p];
+      details = {
+        line: details.line,
+        column: details.column
+      };
+
+      while (p < pos) {
+        if (input.charCodeAt(p) === 10) {
+          details.line++;
+          details.column = 1;
+        } else {
+          details.column++;
+        }
+
+        p++;
+      }
+
+      peg$posDetailsCache[pos] = details;
+
+      return details;
+    }
+  }
+
+  function peg$computeLocation(startPos, endPos) {
+    var startPosDetails = peg$computePosDetails(startPos);
+    var endPosDetails = peg$computePosDetails(endPos);
+
+    return {
+      source: peg$source,
+      start: {
+        offset: startPos,
+        line: startPosDetails.line,
+        column: startPosDetails.column
+      },
+      end: {
+        offset: endPos,
+        line: endPosDetails.line,
+        column: endPosDetails.column
+      }
+    };
+  }
+
+  function peg$fail(expected) {
+    if (peg$currPos < peg$maxFailPos) { return; }
+
+    if (peg$currPos > peg$maxFailPos) {
+      peg$maxFailPos = peg$currPos;
+      peg$maxFailExpected = [];
+    }
+
+    peg$maxFailExpected.push(expected);
+  }
+
+  function peg$buildSimpleError(message, location) {
+    return new peg$SyntaxError(message, null, null, location);
+  }
+
+  function peg$buildStructuredError(expected, found, location) {
+    return new peg$SyntaxError(
+      peg$SyntaxError.buildMessage(expected, found),
+      expected,
+      found,
+      location
+    );
+  }
+
+  function peg$parselinks() {
+    var s0, s1, s2;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = [];
+    s2 = peg$parselinkValue();
+    if (s2 !== peg$FAILED) {
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        s2 = peg$parselinkValue();
+      }
+    } else {
+      s1 = peg$FAILED;
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f0(s1);
+    }
+    s0 = s1;
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e0); }
+    }
+
+    return s0;
+  }
+
+  function peg$parselinkValue() {
+    var s0, s1, s2, s3, s4, s5;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = peg$parseuriReference();
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parseOWS();
+      s3 = peg$parseattributes();
+      if (s3 !== peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 44) {
+          s4 = peg$c0;
+          peg$currPos++;
+        } else {
+          s4 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e2); }
+        }
+        if (s4 === peg$FAILED) {
+          s4 = null;
+        }
+        s5 = peg$parseOWS();
+        peg$savedPos = s0;
+        s0 = peg$f1(s1, s3);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e1); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseuriReference() {
+    var s0, s1, s2, s3, s4;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    if (input.charCodeAt(peg$currPos) === 60) {
+      s1 = peg$c1;
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e4); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parseuri();
+      if (s2 !== peg$FAILED) {
+        if (input.charCodeAt(peg$currPos) === 62) {
+          s3 = peg$c2;
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e5); }
+        }
+        if (s3 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 59) {
+            s4 = peg$c3;
+            peg$currPos++;
+          } else {
+            s4 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e6); }
+          }
+          if (s4 !== peg$FAILED) {
+            peg$savedPos = s0;
+            s0 = peg$f2(s2);
+          } else {
+            peg$currPos = s0;
+            s0 = peg$FAILED;
+          }
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e3); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseuri() {
+    var s0, s1, s2;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = [];
+    if (peg$r0.test(input.charAt(peg$currPos))) {
+      s2 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e8); }
+    }
+    if (s2 !== peg$FAILED) {
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        if (peg$r0.test(input.charAt(peg$currPos))) {
+          s2 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e8); }
+        }
+      }
+    } else {
+      s1 = peg$FAILED;
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f3(s1);
+    }
+    s0 = s1;
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e7); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseattributes() {
+    var s0, s1, s2;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = [];
+    s2 = peg$parselinkParam();
+    if (s2 !== peg$FAILED) {
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        s2 = peg$parselinkParam();
+      }
+    } else {
+      s1 = peg$FAILED;
+    }
+    if (s1 !== peg$FAILED) {
+      peg$savedPos = s0;
+      s1 = peg$f4(s1);
+    }
+    s0 = s1;
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e9); }
+    }
+
+    return s0;
+  }
+
+  function peg$parselinkParam() {
+    var s0, s1, s2, s3, s4, s5, s6, s7;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = peg$parsename();
+    if (s1 !== peg$FAILED) {
+      s2 = peg$parseBWS();
+      if (input.charCodeAt(peg$currPos) === 61) {
+        s3 = peg$c4;
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e11); }
+      }
+      if (s3 !== peg$FAILED) {
+        s4 = peg$parseBWS();
+        s5 = peg$parsevalue();
+        if (s5 !== peg$FAILED) {
+          if (input.charCodeAt(peg$currPos) === 59) {
+            s6 = peg$c3;
+            peg$currPos++;
+          } else {
+            s6 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e6); }
+          }
+          if (s6 === peg$FAILED) {
+            s6 = null;
+          }
+          s7 = peg$parseOWS();
+          peg$savedPos = s0;
+          s0 = peg$f5(s1, s5);
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    if (s0 === peg$FAILED) {
+      s0 = peg$currPos;
+      s1 = peg$parsename();
+      if (s1 !== peg$FAILED) {
+        s2 = peg$parseBWS();
+        if (input.charCodeAt(peg$currPos) === 59) {
+          s3 = peg$c3;
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e6); }
+        }
+        if (s3 === peg$FAILED) {
+          s3 = null;
+        }
+        s4 = peg$parseOWS();
+        peg$savedPos = s0;
+        s0 = peg$f6(s1);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e10); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsename() {
+    var s0, s1, s2;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = [];
+    if (peg$r1.test(input.charAt(peg$currPos))) {
+      s2 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e13); }
+    }
+    if (s2 !== peg$FAILED) {
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        if (peg$r1.test(input.charAt(peg$currPos))) {
+          s2 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e13); }
+        }
+      }
+    } else {
+      s1 = peg$FAILED;
+    }
+    if (s1 !== peg$FAILED) {
+      if (input.charCodeAt(peg$currPos) === 42) {
+        s2 = peg$c5;
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e14); }
+      }
+      if (s2 === peg$FAILED) {
+        s2 = null;
+      }
+      peg$savedPos = s0;
+      s0 = peg$f7(s1, s2);
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e12); }
+    }
+
+    return s0;
+  }
+
+  function peg$parsevalue() {
+    var s0, s1, s2, s3;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    if (peg$r2.test(input.charAt(peg$currPos))) {
+      s1 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e16); }
+    }
+    if (s1 !== peg$FAILED) {
+      s2 = [];
+      if (peg$r3.test(input.charAt(peg$currPos))) {
+        s3 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s3 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e17); }
+      }
+      if (s3 !== peg$FAILED) {
+        while (s3 !== peg$FAILED) {
+          s2.push(s3);
+          if (peg$r3.test(input.charAt(peg$currPos))) {
+            s3 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s3 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e17); }
+          }
+        }
+      } else {
+        s2 = peg$FAILED;
+      }
+      if (s2 !== peg$FAILED) {
+        if (peg$r2.test(input.charAt(peg$currPos))) {
+          s3 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s3 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e16); }
+        }
+        if (s3 !== peg$FAILED) {
+          peg$savedPos = s0;
+          s0 = peg$f8(s2);
+        } else {
+          peg$currPos = s0;
+          s0 = peg$FAILED;
+        }
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    if (s0 === peg$FAILED) {
+      s0 = peg$currPos;
+      s1 = [];
+      if (peg$r4.test(input.charAt(peg$currPos))) {
+        s2 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e18); }
+      }
+      if (s2 !== peg$FAILED) {
+        while (s2 !== peg$FAILED) {
+          s1.push(s2);
+          if (peg$r4.test(input.charAt(peg$currPos))) {
+            s2 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s2 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e18); }
+          }
+        }
+      } else {
+        s1 = peg$FAILED;
+      }
+      if (s1 !== peg$FAILED) {
+        peg$savedPos = s0;
+        s1 = peg$f8(s1);
+      }
+      s0 = s1;
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e15); }
+    }
+
+    return s0;
+  }
+
+  function peg$parseOWS() {
+    var s0, s1;
+
+    peg$silentFails++;
+    s0 = [];
+    if (peg$r5.test(input.charAt(peg$currPos))) {
+      s1 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e20); }
+    }
+    while (s1 !== peg$FAILED) {
+      s0.push(s1);
+      if (peg$r5.test(input.charAt(peg$currPos))) {
+        s1 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s1 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e20); }
+      }
+    }
+    peg$silentFails--;
+    s1 = peg$FAILED;
+    if (peg$silentFails === 0) { peg$fail(peg$e19); }
+
+    return s0;
+  }
+
+  function peg$parseBWS() {
+    var s0, s1;
+
+    peg$silentFails++;
+    s0 = peg$parseOWS();
+    peg$silentFails--;
+    s1 = peg$FAILED;
+    if (peg$silentFails === 0) { peg$fail(peg$e21); }
+
+    return s0;
+  }
+
+  function peg$parseextendedValue() {
+    var s0, s1, s2, s3, s4, s5, s6;
+
+    peg$silentFails++;
+    s0 = peg$currPos;
+    s1 = [];
+    if (peg$r6.test(input.charAt(peg$currPos))) {
+      s2 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e23); }
+    }
+    while (s2 !== peg$FAILED) {
+      s1.push(s2);
+      if (peg$r6.test(input.charAt(peg$currPos))) {
+        s2 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e23); }
+      }
+    }
+    if (peg$r7.test(input.charAt(peg$currPos))) {
+      s2 = input.charAt(peg$currPos);
+      peg$currPos++;
+    } else {
+      s2 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e24); }
+    }
+    if (s2 !== peg$FAILED) {
+      s3 = [];
+      if (peg$r6.test(input.charAt(peg$currPos))) {
+        s4 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s4 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e23); }
+      }
+      while (s4 !== peg$FAILED) {
+        s3.push(s4);
+        if (peg$r6.test(input.charAt(peg$currPos))) {
+          s4 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s4 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e23); }
+        }
+      }
+      if (peg$r7.test(input.charAt(peg$currPos))) {
+        s4 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s4 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e24); }
+      }
+      if (s4 !== peg$FAILED) {
+        s5 = [];
+        if (input.length > peg$currPos) {
+          s6 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s6 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e25); }
+        }
+        while (s6 !== peg$FAILED) {
+          s5.push(s6);
+          if (input.length > peg$currPos) {
+            s6 = input.charAt(peg$currPos);
+            peg$currPos++;
+          } else {
+            s6 = peg$FAILED;
+            if (peg$silentFails === 0) { peg$fail(peg$e25); }
+          }
+        }
+        peg$savedPos = s0;
+        s0 = peg$f9(s1, s3, s5);
+      } else {
+        peg$currPos = s0;
+        s0 = peg$FAILED;
+      }
+    } else {
+      peg$currPos = s0;
+      s0 = peg$FAILED;
+    }
+    if (s0 === peg$FAILED) {
+      s0 = peg$currPos;
+      s1 = [];
+      if (input.length > peg$currPos) {
+        s2 = input.charAt(peg$currPos);
+        peg$currPos++;
+      } else {
+        s2 = peg$FAILED;
+        if (peg$silentFails === 0) { peg$fail(peg$e25); }
+      }
+      while (s2 !== peg$FAILED) {
+        s1.push(s2);
+        if (input.length > peg$currPos) {
+          s2 = input.charAt(peg$currPos);
+          peg$currPos++;
+        } else {
+          s2 = peg$FAILED;
+          if (peg$silentFails === 0) { peg$fail(peg$e25); }
+        }
+      }
+      peg$savedPos = s0;
+      s1 = peg$f10(s1);
+      s0 = s1;
+    }
+    peg$silentFails--;
+    if (s0 === peg$FAILED) {
+      s1 = peg$FAILED;
+      if (peg$silentFails === 0) { peg$fail(peg$e22); }
+    }
+
+    return s0;
+  }
+
+
+  // Per-parsing tracking of attributes which should be ignored after first occurrence.
+  let seenAttributes = [];
+
+
+  peg$result = peg$startRuleFunction();
+
+  if (peg$result !== peg$FAILED && peg$currPos === input.length) {
+    return peg$result;
+  } else {
+    if (peg$result !== peg$FAILED && peg$currPos < input.length) {
+      peg$fail(peg$endExpectation());
+    }
+
+    throw peg$buildStructuredError(
+      peg$maxFailExpected,
+      peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,
+      peg$maxFailPos < input.length
+        ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)
+        : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
+    );
+  }
+}
+
+module.exports = {
+  SyntaxError: peg$SyntaxError,
+  parse: peg$parse
+};

diff --git a/lib/rfc8288-web-linking.peggy b/lib/rfc8288-web-linking.peggy
new file mode 100644 (file)
index 0000000..95b4792
--- /dev/null
+++ b/lib/rfc8288-web-linking.peggy
@@ -0,0 +1,122 @@
+{{
+/* Generated code is not pretty, ignore a lot of this horrorstyle. */
+/* eslint-disable quotes */
+/* eslint-disable vars-on-top */
+/* eslint-disable no-control-regex */
+/* eslint-disable security/detect-object-injection */
+/* eslint-disable vars-on-top */
+/* eslint-disable brace-style */
+/* eslint-disable comma-dangle */
+/* eslint-disable no-unused-vars */
+
+function makeString(o) {
+  return o.join('');
+}
+
+const onlyFirstAttributes = [
+  'media',
+  'rel',
+  'title',
+  'title*',
+  'type',
+];
+
+}}
+
+{
+// Per-parsing tracking of attributes which should be ignored after first occurrence.
+let seenAttributes = [];
+}
+
+links 'links'
+  = links:linkValue+ {
+    return links;
+  }
+
+linkValue 'link-value'
+  = uriReference:uriReference OWS attributes:attributes ','? OWS {
+    seenAttributes = [];
+    return {
+      target: uriReference,
+      attributes,
+    };
+  }
+
+uriReference 'uri-reference'
+  = '<' uri:uri '>' ';' { 
+    return uri;
+  }
+
+uri 'uri'
+  = uri:[^>]+ {
+    return makeString(uri);
+  }
+
+attributes 'attributes'
+  = attrs:linkParam+ {
+    return attrs.filter((a) => a);
+  }
+
+linkParam 'link-param'
+  = name:name BWS '=' BWS value:value ';'? OWS {
+    if (onlyFirstAttributes.includes(name.name)) {
+      if (seenAttributes.includes(name.name)) {
+        // Repeat of singleton attribute, ignore it.
+        return;
+      }
+      seenAttributes.push(name.name);
+    }
+    return {
+      ...name,
+      ...value,
+    };
+  }
+  / name:name BWS ';'? OWS {
+    return {
+      ...name,
+      value: null,
+    }
+  }
+
+name 'name'
+  = name:[a-zA-Z]+ extended:'*'? {
+    return {
+      name: makeString(name.concat(extended)).toLowerCase(),
+      extended: !!extended,
+    };
+  }
+
+value 'value'
+  = ["] value:[^"]+ ["] {
+    return {
+      value: makeString(value),
+    };
+  }
+  / value:[^";,]+ {
+    return {
+      value: makeString(value),
+    };
+  }
+
+OWS 'whitespace'
+  = spaces:[ ]*
+
+BWS 'bad whitespace'
+  = OWS
+
+// This is also an alternate startRule.
+extendedValue 'extended-value'
+  = encoding:[^']* ['] language:[^']* ['] value:.* {
+    return {
+      encoding: encoding.length ? makeString(encoding) : 'UTF-8',
+      language: language.length ? makeString(language) : null,
+      value: decodeURIComponent(makeString(value)),
+    };
+  }
+  / value:.* {
+    return {
+      encoding: null,
+      language: null,
+      value: makeString(value),
+    };
+  }

diff --git a/package-lock.json b/package-lock.json
new file mode 100644 (file)
index 0000000..2035318
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2830 @@
+{
+  "name": "@squeep/web-linking",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.12.11",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.12.11.tgz",
+      "integrity": "sha512-Zt1yodBx1UcyiePMSkWnU4hPqhwq7hGi2nFL1LeA3EUl+q2LQx16MISgJ0+z7dnmgvP9QtIleuETGOiOH1RcIw==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.10.4"
+      }
+    },
+    "@babel/compat-data": {
+      "version": "7.14.7",
+      "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.14.7.tgz",
+      "integrity": "sha512-nS6dZaISCXJ3+518CWiBfEr//gHyMO02uDxBkXTKZDN5POruCnOZ1N4YBRZDCabwF8nZMWBpRxIicmXtBs+fvw==",
+      "dev": true
+    },
+    "@babel/core": {
+      "version": "7.14.6",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.14.6.tgz",
+      "integrity": "sha512-gJnOEWSqTk96qG5BoIrl5bVtc23DCycmIePPYnamY9RboYdI4nFy5vAQMSl81O5K/W0sLDWfGysnOECC+KUUCA==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.14.5",
+        "@babel/generator": "^7.14.5",
+        "@babel/helper-compilation-targets": "^7.14.5",
+        "@babel/helper-module-transforms": "^7.14.5",
+        "@babel/helpers": "^7.14.6",
+        "@babel/parser": "^7.14.6",
+        "@babel/template": "^7.14.5",
+        "@babel/traverse": "^7.14.5",
+        "@babel/types": "^7.14.5",
+        "convert-source-map": "^1.7.0",
+        "debug": "^4.1.0",
+        "gensync": "^1.0.0-beta.2",
+        "json5": "^2.1.2",
+        "semver": "^6.3.0",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.14.5",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.14.5.tgz",
+          "integrity": "sha512-9pzDqyc6OLDaqe+zbACgFkb6fKMNG6CObKpnYXChRsvYGyEdc7CA2BaqeOM+vOtCS5ndmJicPJhKAwYRI6UfFw==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.14.5"
+          }
+        },
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        }
+      }
+    },
+    "@babel/generator": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.14.5.tgz",
+      "integrity": "sha512-y3rlP+/G25OIX3mYKKIOlQRcqj7YgrvHxOLbVmyLJ9bPmi5ttvUmpydVjcFjZphOktWuA7ovbx91ECloWTfjIA==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.14.5",
+        "jsesc": "^2.5.1",
+        "source-map": "^0.5.0"
+      }
+    },
+    "@babel/helper-compilation-targets": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-compilation-targets/-/helper-compilation-targets-7.14.5.tgz",
+      "integrity": "sha512-v+QtZqXEiOnpO6EYvlImB6zCD2Lel06RzOPzmkz/D/XgQiUu3C/Jb1LOqSt/AIA34TYi/Q+KlT8vTQrgdxkbLw==",
+      "dev": true,
+      "requires": {
+        "@babel/compat-data": "^7.14.5",
+        "@babel/helper-validator-option": "^7.14.5",
+        "browserslist": "^4.16.6",
+        "semver": "^6.3.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
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diff --git a/package.json b/package.json
new file mode 100644 (file)
index 0000000..113db29
--- /dev/null
+++ b/package.json
@@ -0,0 +1,43 @@
+{
+  "name": "@squeep/web-linking",
+  "version": "1.0.0",
+  "description": "Parser for RFC 8288 Link headers",
+  "main": "index.js",
+  "scripts": {
+    "coverage": "nyc npm test",
+    "eslint": "eslint *.js lib",
+    "generate": "peggy --extra-options-file peggy-options.json lib/rfc8288-web-linking.peggy",
+    "test": "mocha --recursive"
+  },
+  "pre-commit": [
+    "generate",
+    "eslint",
+    "coverage"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://git.squeep.com/squeep-web-linking/"
+  },
+  "keywords": [
+    "header",
+    "http",
+    "link",
+    "PEG",
+    "rfc8288"
+  ],
+  "engines": {
+    "node": ">=12.9"
+  },
+  "author": "Justin Wind <jwind-npm@squeep.com>",
+  "license": "ISC",
+  "devDependencies": {
+    "eslint": "^7.32.0",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-security": "^1.4.0",
+    "eslint-plugin-sonarjs": "^0.9.1",
+    "mocha": "^9.0.3",
+    "nyc": "^15.1.0",
+    "peggy": "^1.2.0",
+    "pre-commit": "^1.2.2"
+  }
+}

diff --git a/peggy-options.json b/peggy-options.json
new file mode 100644 (file)
index 0000000..683450f
--- /dev/null
+++ b/peggy-options.json
@@ -0,0 +1,9 @@
+{
+  "allowedStartRules": [
+    "links",
+    "extendedValue"
+  ],
+  "format": "commonjs",
+  "optimize": "speed",
+  "output": "source"
+}

diff --git a/reference/rfc8288-errata.html b/reference/rfc8288-errata.html
new file mode 100644 (file)
index 0000000..9ab80cf
--- /dev/null
+++ b/reference/rfc8288-errata.html
@@ -0,0 +1,859 @@
+<!DOCTYPE html>\r
+<html>\r
+    <link rel="profile" href="http://gmpg.org/xfn/11" />\r
+        <meta charset="UTF-8" />\r
+        <meta http-equiv="X-UA-Compatible" content="IE=Edge" />\r
+        <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />        <title>RFC Errata Report &raquo; RFC Editor</title> \r
+        <meta name="generator" content="WordPress 5.0.3" /> <!-- leave this for stats -->\r
+        <link rel="stylesheet" type="text/css" media="screen" href="https://www.rfc-editor.org/wp-content/themes/techozoic-fluid/style.css" />\r
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+        font-size:12px;\r
+        color:#333333;\r
+        border-width: 1px;\r
+        border-color: #666666;\r
+        border-collapse: collapse;\r
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+        padding: 8px;\r
+        border-style: solid;\r
+        border-left: 1em;\r
+        border-right: 1em;\r
+        border-color: #D2D2D2;\r
+        background-color: #CACACA;\r
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+        padding: 8px;\r
+        border-style:solid;\r
+        border-left: 1em;\r
+        border-right: 1em;\r
+        border-color: #D2D2D2;\r
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+          color:grey\r
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+        font-size:12px;\r
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+    padding:0 0 10px;\r
+    width:70%;\r
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+    vertical-align: baseline;\r
+    margin: 0 2px;\r
+    outline: none;\r
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+    text-align: center;\r
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+    text-shadow: 0 1px 1px rgba(0,0,0,.3);\r
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+    color: #505050;\r
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+\r
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+                     font-weight: bold;\r
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+   font-size: inherit;\r
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+/*--------------------------------------------------------------------------------\r
+----------------------------RFCMETA PAGE  Styles---------------------------------------\r
+-------------------------------------------------------------------------------*/\r
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+  padding-top: 20px !important;\r
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+\r
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+   font-size: 50px;\r
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+   font:bold !important;}\r
+\r
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+   font-size: 18px;\r
+   padding: 0px;\r
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+   padding-top: 10px;\r
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+    h2 {font-weight: bold;}\r
+\r
+ body.rfcmeta   #search_query_separator_id  {padding-bottom: 5px;\r
+ padding-top: 5px;}\r
+\r
+ body.rfcmeta .page {margin-top: 0px!important;\r
+ padding-top: 0px!important;}\r
+\r
+    /*--------------------------------------------------------------------------------\r
+----------------------------end RFCMETA PAGE Styles---------------------------------------\r
+-------------------------------------------------------------------------------*/\r
+\r
+.cluster_heading {\r
+ font-size: 14px;\r
+}\r
+</style>    <style type="text/css">\r
+        #header {\r
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+<input type="text" id ="combo_box_id" name="combo_box"  maxlength="40" size ="35" placeholder="number, title, keyword, or author surname"></form>\r
+<a href="/search/rfc_search.php">Advanced Search</a>\r
+</div>
+               </div></div>
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+\r
+            </div><!--end header-->\r
+\r
+            <div id="l_sidebar" class="sidebar"> 
+    <ul>
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+               </li>
+    </ul>
+</div>
+<div id="content" class="narrowcolumn">
+     <h1 class="post_title">RFC Errata</h1>
+
+     <div class="post-127 page type-page status-publish hentry post clear" id="post-127">
+     <div class="singlepost entry">
+
+<br><form method="get" id="query" action="/errata_search.php" onsubmit="return validateRFCSearchForm(this);">
+  <table  align="center" class="erratasearch">
+     <tr>
+       <th colspan="4"><h3>Errata Search</h3></th>
+     </tr>
+     <tr class="ibar">
+       <td class="search_label_bold" colspan="2">
+         <label for="rfc">RFC Number:</label>
+         <input type="text" id="rfc" name="rfc" size="4" maxlength="4" value="8288" />
+        </td>
+       <td  class="search_label_bold" colspan="2">
+         <label for="eid">Errata ID:</label>
+         <input type="text" id="eid" name="eid" size="4" maxlength="4" />
+       </td>
+     </tr>
+    <tr><td colspan="4">&nbsp;</td></tr>
+     <tr>
+       <td style="text-decoration: underline;">Source of RFC</td>
+
+       <td>&nbsp;</td>       <td><label for="rec_status">Status:</label></td>
+       <td>
+           <select name="rec_status" id="rec_status">             <option value="15">All/Any</option>
+<option value="0" >Verified+Reported</option>             <option value="1">Verified</option>
+             <option value="2">Reported</option>
+             <option value="3">Held for Document Update</option>
+             <option value="9">Rejected</option>
+           </select>
+       </td>
+     </tr>
+     <tr>
+       <td><label for="area_acronym">Area Acronym:</label></td>
+       <td class="userdata">
+           <select name="area_acronym" id="area_acronym"><option value="" selected="selected">All/Any</option>
+             <option value="app">app</option>
+             <option value="art">art</option>
+             <option value="gen">gen</option>
+             <option value="int">int</option>
+             <option value="ops">ops</option>
+             <option value="rai">rai</option>
+             <option value="rtg">rtg</option>
+             <option value="sec">sec</option>
+             <option value="tsv">tsv</option>
+            </select>
+       </td>
+       <td>
+          <label for="errata_type">Type:</label>
+       </td>
+       <td class="userdata">
+           <select name="errata_type" id="errata_type">
+             <option value="" selected="selected">All/Any</option>             <option value=1>Editorial</option>
+             <option value=2>Technical</option>
+           </select>
+        </td>
+     </tr>
+     <tr>
+       <td>
+          <label for="wg_acronym">WG Acronym:</label>
+       </td>
+       <td class="userdata">
+          <input id="wg_acronym" size="6" type="text" name="wg_acronym" maxlength="10" />
+         </td>
+       <td>
+          <label for="submitter_name">Submitter Name:</label>
+       </td>
+       <td class="userdata">
+          <input id="submitter_name" size="20" type="text" name="submitter_name" maxlength="60" />
+       </td>
+     </tr>
+     <tr>
+       <td>
+          <label for="stream_name">Other:</label>
+       </td>
+       <td class="userdata">
+          <select name="stream_name" id="stream_name"><option value="" selected="selected">All/Any</option>
+            <option value="IAB">IAB</option>
+            <option value="INDEPENDENT">INDEPENDENT</option>
+            <option value="IRTF">IRTF</option>
+            <option value="Legacy">Legacy</option>
+          </select>
+       </td>
+       <td>
+          <label for="submit_date">Date Submitted:</label>
+       </td>
+       <td class="userdata">
+          <input id="submit_date" size="8" type="text" name="submit_date" maxlength="10" />
+       </td>
+     </tr>
+     <tr>
+       <td colspan="4" class="sbar">
+         <div>
+        Summary Table<input type="radio" name="presentation"  id="presentationT" value="table">
+        Full Records<input type="radio" name="presentation"  id="presentationR" checked="on" value="records">
+         </div>
+         <input type="submit" value="Search" />
+         <input type="button" value="Reset Fields" onclick="return clearAdvSearchForm(document.forms.query);" />
+       </td>
+     </tr>
+  </table>
+</form>
+<script type="text/javascript">
+<!--
+           document.forms.query.rfc.focus();
+//-->
+</script>
+<p>Found 4 records.</p>
+<h2>Status: <a href="status_type_desc.html">Verified</a> (1)</h2>
+<h3><a href="http://www.rfc-editor.org/rfc/rfc8288.txt" target="_blank">RFC&nbsp;8288</a>, "Web Linking", October 2017</h3>
+<a href="/source/">Source of RFC</a>: IETF - NON WORKING GROUP<br />
+Area Assignment: art<br />
+<p>
+Errata ID: <a href="/errata/eid5878">5878</a><br />
+<b>Status: Verified<br />
+Type: Technical<br />
+Publication Format(s) : TEXT</b><br />
+Reported By: Jinoh Kang<br />
+Date Reported: 2019-10-22<br />
+Verifier Name: Barry Leiba<br />
+Date Verified: 2019-10-24<br />
+</p>
+<p>Section B.2 says:
+</p>
+<pre class="rfctext">
+       15.  Let star_param_names be the set of param_names in the\r
+            (param_name, param_value) tuples of link_parameters where\r
+            the last character of param_name is an asterisk (&quot;*&quot;).\r
+       16.  For each star_param_name in star_param_names:\r
+            1.  Let base_param_name be star_param_name with the last\r
+                character removed.\r
+            2.  If the implementation does not choose to support an\r
+                internationalised form of a parameter named\r
+                base_param_name for any reason (including, but not\r
+                limited to, it being prohibited by the parameter's\r
+                specification), remove all tuples from link_parameters\r
+                whose first member is star_param_name, and skip to the\r
+                next star_param_name.\r
+            3.  Remove all tuples from link_parameters whose first\r
+                member is base_param_name.\r
+            4.  Change the first member of all tuples in link_parameters\r
+                whose first member is star_param_name to\r
+                base_param_name.
+</pre>
+<p>It should say:</p>
+<pre class="rfctext">
+       15.  Let star_param_names be the set of param_names in the\r
+            (param_name, param_value) tuples of target_attributes where\r
+            the last character of param_name is an asterisk (&quot;*&quot;).\r
+       16.  For each star_param_name in star_param_names:\r
+            1.  Let base_param_name be star_param_name with the last\r
+                character removed.\r
+            2.  If the implementation does not choose to support an\r
+                internationalised form of a parameter named\r
+                base_param_name for any reason (including, but not\r
+                limited to, it being prohibited by the parameter's\r
+                specification), remove all tuples from target_attributes\r
+                whose first member is star_param_name, and skip to the\r
+                next star_param_name.\r
+            3.  Remove all tuples from target_attributes whose first\r
+                member is base_param_name.\r
+            4.  Change the first member of all tuples in target_attributes\r
+                whose first member is star_param_name to\r
+                base_param_name.
+</pre>
+<p>Notes:</p>
+<p class="simpleindent">
+The modified link_parameters value is not used, but target_attributes is. Additionally, the normative part of the document states that the RFC 8187 decoding scheme MAY be used for target attributes (especially extension attributes), not the ones that belong to the general link model.
+</p>
+<div class="special_hr"></div><h2>Status: <a href="status_type_desc.html">Reported</a> (3)</h2>
+<h3><a href="http://www.rfc-editor.org/rfc/rfc8288.txt" target="_blank">RFC&nbsp;8288</a>, "Web Linking", October 2017</h3>
+<a href="/source/">Source of RFC</a>: IETF - NON WORKING GROUP<br />
+Area Assignment: art<br />
+<p>
+Errata ID: <a href="/errata/eid5319">5319</a><br />
+<b>Status: Reported<br />
+Type: Technical<br />
+Publication Format(s) : TEXT</b><br />
+Reported By: Jeffrey Yasskin<br />
+Date Reported: 2018-04-04<br />
+</p>
+<p>Section 1.1 says:
+</p>
+<pre class="rfctext">
+   This document uses the Augmented Backus-Naur Form (ABNF) [RFC5234]\r
+   notation of [RFC7230], including the #rule, and explicitly includes\r
+   the following rules from it: quoted-string, token, SP (space), BWS\r
+   (bad whitespace), OWS (optional whitespace), RWS (required\r
+   whitespace), LOALPHA, DIGIT.
+</pre>
+<p>It should say:</p>
+<pre class="rfctext">
+   This document uses the Augmented Backus-Naur Form (ABNF) [RFC5234]\r
+   notation of [RFC7230], including the #rule, and explicitly includes\r
+   the following rules from it: quoted-string, token, SP (space), BWS\r
+   (bad whitespace), OWS (optional whitespace), RWS (required\r
+   whitespace), DIGIT. It also uses the following additional rule:\r
+\r
+   LOALPHA = %x61-7A\r
+\r
+   
+</pre>
+<p>Notes:</p>
+<p class="simpleindent">
+I can't find a definition of LOALPHA in RFC5234 or RFC7230. I see a definition in RFC2616, which seems to have been dropped in the update.
+</p>
+<div class="special_hr"></div><p>
+Errata ID: <a href="/errata/eid5168">5168</a><br />
+<b>Status: Reported<br />
+Type: Editorial<br />
+Publication Format(s) : TEXT</b><br />
+Reported By: Sawood Alam<br />
+Date Reported: 2017-10-25<br />
+</p>
+<p>Section B.3 says:
+</p>
+<pre class="rfctext">
+input is modified to remove the parsed parameters.
+</pre>
+<p>It should say:</p>
+<pre class="rfctext">
+Input is modified to remove the parsed parameters.
+</pre>
+<p>Notes:</p>
+<p class="simpleindent">
+The first letter of the sentence is not capitalized.
+</p>
+<div class="special_hr"></div><p>
+Errata ID: <a href="/errata/eid5169">5169</a><br />
+<b>Status: Reported<br />
+Type: Editorial<br />
+Publication Format(s) : TEXT</b><br />
+Reported By: Sawood Alam<br />
+Date Reported: 2017-10-25<br />
+</p>
+<p>Section B.4 says:
+</p>
+<pre class="rfctext">
+input is modified to remove the parsed string.
+</pre>
+<p>It should say:</p>
+<pre class="rfctext">
+Input is modified to remove the parsed string.
+</pre>
+<p>Notes:</p>
+<p class="simpleindent">
+The first letter of the sentence is not capitalized.
+</p>
+<div class="special_hr"></div><!-- <p>No records found for status Held for Document Update.</p> -->
+<!-- <p>No records found for status Rejected.</p> -->
+
+<p><a href="/errata.php#reportnew">Report New Errata</a></p>   </div>
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diff --git a/reference/rfc8288.html b/reference/rfc8288.html
new file mode 100644 (file)
index 0000000..ce1748d
--- /dev/null
+++ b/reference/rfc8288.html
@@ -0,0 +1,1542 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head profile="http://dublincore.org/documents/2008/08/04/dc-html/">
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    <meta name="robots" content="index,follow" />
+    <meta name="creator" content="rfcmarkup version 1.129d on tools.ietf.org" />
+    <link rel="schema.DC" href="http://purl.org/dc/elements/1.1/" />
+<meta name="DC.Relation.Replaces" content="rfc5988" />
+<meta name="DC.Identifier" content="urn:ietf:rfc:8288" />
+<meta name="DC.Date.Issued" content="October, 2017" />
+<meta name="DC.Creator" content="Mark Nottingham &lt;mnot@mnot.net&gt;" />
+<meta name="DC.Description.Abstract" content="This specification defines a model for the relationships between
+resources on the Web (&quot;links&quot;) and the type of those relationships
+(&quot;link relation types&quot;).  It also defines the serialisation of such
+links in HTTP headers with the Link header field." />
+<meta name="DC.Title" content="Web Linking" />
+
+    <link rel="icon" href="/images/rfc.png" type="image/png" />
+    <link rel="shortcut icon" href="/images/rfc.png" type="image/png" />
+    <title>RFC 8288 - Web Linking</title>
+    
+    
+    <style type="text/css">
+       @media only screen 
+         and (min-width: 992px)
+         and (max-width: 1199px) {
+           body { font-size: 14pt; }
+            div.content { width: 96ex; margin: 0 auto; }
+        }
+       @media only screen 
+         and (min-width: 768px)
+         and (max-width: 991px) {
+            body { font-size: 14pt; }
+            div.content { width: 96ex; margin: 0 auto; }
+        }
+       @media only screen 
+         and (min-width: 480px)
+         and (max-width: 767px) {
+            body { font-size: 11pt; }
+            div.content { width: 96ex; margin: 0 auto; }
+        }
+       @media only screen 
+         and (max-width: 479px) {
+            body { font-size: 8pt; }
+            div.content { width: 96ex; margin: 0 auto; }
+        }
+       @media only screen 
+         and (min-device-width : 375px) 
+         and (max-device-width : 667px) {
+            body { font-size: 9.5pt; }
+            div.content { width: 96ex; margin: 0; }
+        }
+       @media only screen 
+         and (min-device-width: 1200px) {
+            body { font-size: 10pt; margin: 0 4em; }
+            div.content { width: 96ex; margin: 0; }
+        }
+        h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6 {
+           font-weight: bold;
+            /* line-height: 0pt; */
+            display: inline;
+            white-space: pre;
+            font-family: monospace;
+            font-size: 1em;
+           font-weight: bold;
+        }
+        pre {
+            font-size: 1em;
+            margin-top: 0px;
+            margin-bottom: 0px;
+        }
+       .pre {
+           white-space: pre;
+           font-family: monospace;
+       }
+       .header{
+           font-weight: bold;
+       }
+        .newpage {
+            page-break-before: always;
+        }
+        .invisible {
+            text-decoration: none;
+            color: white;
+        }
+        a.selflink {
+          color: black;
+          text-decoration: none;
+        }
+        @media print {
+            body {
+                font-family: monospace;
+                font-size: 10.5pt;
+            }
+            h1, h2, h3, h4, h5, h6 {
+                font-size: 1em;
+            }
+        
+            a:link, a:visited {
+                color: inherit;
+                text-decoration: none;
+            }
+            .noprint {
+                display: none;
+            }
+        }
+       @media screen {
+           .grey, .grey a:link, .grey a:visited {
+               color: #777;
+           }
+            .docinfo {
+                background-color: #EEE;
+            }
+            .top {
+                border-top: 7px solid #EEE;
+            }
+            .pad {
+                padding-top: 7px;
+                line-height: 24px;
+                padding-bottom: 4px;
+            }
+            .bgwhite  { background-color: white; }
+            .bgred    { background-color: #F44; }
+            .bggrey   { background-color: #666; }
+            .bgbrown  { background-color: #840; }            
+            .bgorange { background-color: #FA0; }
+            .bgyellow { background-color: #EE0; }
+            .bgmagenta{ background-color: #F4F; }
+            .bgblue   { background-color: #66F; }
+            .bgcyan   { background-color: #4DD; }
+            .bggreen  { background-color: #4F4; }
+
+            .legend   { font-size: 90%; }
+            .cplate   { font-size: 70%; border: solid grey 1px; }
+       }
+    </style>
+    <!--[if IE]>
+    <style>
+    body {
+       font-size: 13px;
+       margin: 10px 10px;
+    }
+    </style>
+    <![endif]-->
+
+    <script type="text/javascript"><!--
+    function addHeaderTags() {
+       var spans = document.getElementsByTagName("span");
+       for (var i=0; i < spans.length; i++) {
+           var elem = spans[i];
+           if (elem) {
+               var level = elem.getAttribute("class");
+                if (level == "h1" || level == "h2" || level == "h3" || level == "h4" || level == "h5" || level == "h6") {
+                    elem.innerHTML = "<"+level+">"+elem.innerHTML+"</"+level+">";              
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+           }
+       }
+    }
+    var legend_html = "Colour legend:<br />      <table>         <tr><td>Unknown:</td>                   <td><span class='cplate bgwhite'>&nbsp;&nbsp;&nbsp;&nbsp;</span></td></tr>         <tr><td>Draft:</td>                     <td><span class='cplate bgred'>&nbsp;&nbsp;&nbsp;&nbsp;</span></td></tr>         <tr><td>Informational:</td>             <td><span class='cplate bgorange'>&nbsp;&nbsp;&nbsp;&nbsp;</span></td></tr>         <tr><td>Experimental:</td>              <td><span class='cplate bgyellow'>&nbsp;&nbsp;&nbsp;&nbsp;</span></td></tr>         <tr><td>Best Common Practice:</td>      <td><span class='cplate bgmagenta'>&nbsp;&nbsp;&nbsp;&nbsp;</span></td></tr>         <tr><td>Proposed Standard:</td>         <td><span class='cplate bgblue'>&nbsp;&nbsp;&nbsp;&nbsp;</span></td></tr>         <tr><td>Draft Standard (old designation):</td> <td><span class='cplate bgcyan'>&nbsp;&nbsp;&nbsp;&nbsp;</span></td></tr>         <tr><td>Internet Standard:</td>         <td><span class='cplate bggreen'>&nbsp;&nbsp;&nbsp;&nbsp;</span></td></tr>         <tr><td>Historic:</td>                  <td><span class='cplate bggrey'>&nbsp;&nbsp;&nbsp;&nbsp;</span></td></tr>         <tr><td>Obsolete:</td>                  <td><span class='cplate bgbrown'>&nbsp;&nbsp;&nbsp;&nbsp;</span></td></tr>     </table>";
+    function showElem(id) {
+        var elem = document.getElementById(id);
+        elem.innerHTML = eval(id+"_html");
+        elem.style.visibility='visible';
+    }
+    function hideElem(id) {
+        var elem = document.getElementById(id);
+        elem.style.visibility='hidden';        
+        elem.innerHTML = "";
+    }
+    // -->
+    </script>
+</head>
+<body onload="addHeaderTags()">
+  <div class="content">
+   <div style="height: 13px;">
+      <div onmouseover="this.style.cursor='pointer';"
+         onclick="showElem('legend');"
+         onmouseout="hideElem('legend')"
+        style="height: 6px; position: absolute;"
+         class="pre noprint docinfo bgblue"
+         title="Click for colour legend." >                                                                        </div>
+      <div id="legend"
+           class="docinfo noprint pre legend"
+           style="position:absolute; top: 4px; left: 4ex; visibility:hidden; background-color: white; padding: 4px 9px 5px 7px; border: solid #345 1px; "
+           onmouseover="showElem('legend');"
+           onmouseout="hideElem('legend');">
+      </div>
+   </div>
+<span class="pre noprint docinfo top">[<a href="../html/" title="Document search and retrieval page">Docs</a>] [<a href="/rfc/rfc8288.txt" title="Plaintext version of this document">txt</a>|<a href="/pdf/rfc8288" title="PDF version of this document">pdf</a>] [<a href="./draft-nottingham-rfc5988bis" title="draft-nottingham-rfc5988bis">draft-nottingha...</a>] [<a href='https://datatracker.ietf.org/doc/rfc8288' title='IESG Datatracker information for this document'>Tracker</a>] [<a href="/rfcdiff?difftype=--hwdiff&amp;url2=rfc8288" title="Inline diff (wdiff)">Diff1</a>] [<a href="/rfcdiff?url2=rfc8288" title="Side-by-side diff">Diff2</a>] [<a href="https://www.rfc-editor.org/errata_search.php?rfc=8288">Errata</a>]</span><br />
+<span class="pre noprint docinfo">                                                                        </span><br />
+<span class="pre noprint docinfo">                                                       PROPOSED STANDARD</span><br />
+<span class="pre noprint docinfo">                                                            <span style='color: #C00;'>Errata Exist</span></span><br />
+<pre>
+Internet Engineering Task Force (IETF)                     M. Nottingham
+Request for Comments: 8288                                  October 2017
+Obsoletes: <a href="./rfc5988">5988</a>
+Category: Standards Track
+ISSN: 2070-1721
+
+
+                              <span class="h1">Web Linking</span>
+
+Abstract
+
+   This specification defines a model for the relationships between
+   resources on the Web ("links") and the type of those relationships
+   ("link relation types").
+
+   It also defines the serialisation of such links in HTTP headers with
+   the Link header field.
+
+Status of This Memo
+
+   This is an Internet Standards Track document.
+
+   This document is a product of the Internet Engineering Task Force
+   (IETF).  It represents the consensus of the IETF community.  It has
+   received public review and has been approved for publication by the
+   Internet Engineering Steering Group (IESG).  Further information on
+   Internet Standards is available in <a href="./rfc7841#section-2">Section&nbsp;2 of RFC 7841</a>.
+
+   Information about the current status of this document, any errata,
+   and how to provide feedback on it may be obtained at
+   <a href="https://www.rfc-editor.org/info/rfc8288">https://www.rfc-editor.org/info/rfc8288</a>.
+
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+<span class="grey">Nottingham                   Standards Track                    [Page 1]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-2" id="page-2" href="#page-2" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+Copyright Notice
+
+   Copyright (c) 2017 IETF Trust and the persons identified as the
+   document authors.  All rights reserved.
+
+   This document is subject to <a href="./bcp78">BCP 78</a> and the IETF Trust's Legal
+   Provisions Relating to IETF Documents
+   (<a href="https://trustee.ietf.org/license-info">https://trustee.ietf.org/license-info</a>) in effect on the date of
+   publication of this document.  Please review these documents
+   carefully, as they describe your rights and restrictions with respect
+   to this document.  Code Components extracted from this document must
+   include Simplified BSD License text as described in Section 4.e of
+   the Trust Legal Provisions and are provided without warranty as
+   described in the Simplified BSD License.
+
+   This document may contain material from IETF Documents or IETF
+   Contributions published or made publicly available before November
+   10, 2008.  The person(s) controlling the copyright in some of this
+   material may not have granted the IETF Trust the right to allow
+   modifications of such material outside the IETF Standards Process.
+   Without obtaining an adequate license from the person(s) controlling
+   the copyright in such materials, this document may not be modified
+   outside the IETF Standards Process, and derivative works of it may
+   not be created outside the IETF Standards Process, except to format
+   it for publication as an RFC or to translate it into languages other
+   than English.
+
+
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+<span class="grey">Nottingham                   Standards Track                    [Page 2]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-3" id="page-3" href="#page-3" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+Table of Contents
+
+   <a href="#section-1">1</a>.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   <a href="#page-4">4</a>
+     <a href="#section-1.1">1.1</a>.  Notational Conventions  . . . . . . . . . . . . . . . . .   <a href="#page-4">4</a>
+     <a href="#section-1.2">1.2</a>.  Conformance and Error Handling  . . . . . . . . . . . . .   <a href="#page-4">4</a>
+   <a href="#section-2">2</a>.  Links . . . . . . . . . . . . . . . . . . . . . . . . . . . .   <a href="#page-6">6</a>
+     <a href="#section-2.1">2.1</a>.  Link Relation Types . . . . . . . . . . . . . . . . . . .   <a href="#page-6">6</a>
+       <a href="#section-2.1.1">2.1.1</a>.  Registered Relation Types . . . . . . . . . . . . . .   <a href="#page-6">6</a>
+       <a href="#section-2.1.2">2.1.2</a>.  Extension Relation Types  . . . . . . . . . . . . . .   <a href="#page-8">8</a>
+     <a href="#section-2.2">2.2</a>.  Target Attributes . . . . . . . . . . . . . . . . . . . .   <a href="#page-9">9</a>
+   <a href="#section-3">3</a>.  Link Serialisation in HTTP Headers  . . . . . . . . . . . . .   <a href="#page-9">9</a>
+     <a href="#section-3.1">3.1</a>.  Link Target . . . . . . . . . . . . . . . . . . . . . . .  <a href="#page-10">10</a>
+     <a href="#section-3.2">3.2</a>.  Link Context  . . . . . . . . . . . . . . . . . . . . . .  <a href="#page-10">10</a>
+     <a href="#section-3.3">3.3</a>.  Relation Type . . . . . . . . . . . . . . . . . . . . . .  <a href="#page-11">11</a>
+     <a href="#section-3.4">3.4</a>.  Target Attributes . . . . . . . . . . . . . . . . . . . .  <a href="#page-11">11</a>
+       <a href="#section-3.4.1">3.4.1</a>.  Serialisation-Defined Attributes  . . . . . . . . . .  <a href="#page-11">11</a>
+       <a href="#section-3.4.2">3.4.2</a>.  Extension Attributes  . . . . . . . . . . . . . . . .  <a href="#page-13">13</a>
+     <a href="#section-3.5">3.5</a>.  Link Header Field Examples  . . . . . . . . . . . . . . .  <a href="#page-13">13</a>
+   <a href="#section-4">4</a>.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  <a href="#page-14">14</a>
+     <a href="#section-4.1">4.1</a>.  Link HTTP Header Field Registration . . . . . . . . . . .  <a href="#page-14">14</a>
+     <a href="#section-4.2">4.2</a>.  Link Relation Type Registry . . . . . . . . . . . . . . .  <a href="#page-14">14</a>
+     <a href="#section-4.3">4.3</a>.  Link Relation Application Data Registry . . . . . . . . .  <a href="#page-15">15</a>
+   <a href="#section-5">5</a>.  Security Considerations . . . . . . . . . . . . . . . . . . .  <a href="#page-15">15</a>
+   <a href="#section-6">6</a>.  Internationalisation Considerations . . . . . . . . . . . . .  <a href="#page-16">16</a>
+   <a href="#section-7">7</a>.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  <a href="#page-16">16</a>
+     <a href="#section-7.1">7.1</a>.  Normative References  . . . . . . . . . . . . . . . . . .  <a href="#page-16">16</a>
+     <a href="#section-7.2">7.2</a>.  Informative References  . . . . . . . . . . . . . . . . .  <a href="#page-17">17</a>
+   <a href="#appendix-A">Appendix A</a>.  Notes on Other Link Serialisations . . . . . . . . .  <a href="#page-19">19</a>
+     <a href="#appendix-A.1">A.1</a>.  Link Serialisation in HTML  . . . . . . . . . . . . . . .  <a href="#page-19">19</a>
+     <a href="#appendix-A.2">A.2</a>.  Link Serialisation in Atom  . . . . . . . . . . . . . . .  <a href="#page-19">19</a>
+   <a href="#appendix-B">Appendix B</a>.  Algorithms for Parsing Link Header Fields  . . . . .  <a href="#page-20">20</a>
+     <a href="#appendix-B.1">B.1</a>.  Parsing a Header Set for Links  . . . . . . . . . . . . .  <a href="#page-20">20</a>
+     <a href="#appendix-B.2">B.2</a>.  Parsing a Link Field Value  . . . . . . . . . . . . . . .  <a href="#page-21">21</a>
+     <a href="#appendix-B.3">B.3</a>.  Parsing Parameters  . . . . . . . . . . . . . . . . . . .  <a href="#page-22">22</a>
+     <a href="#appendix-B.4">B.4</a>.  Parsing a Quoted String . . . . . . . . . . . . . . . . .  <a href="#page-23">23</a>
+   <a href="#appendix-C">Appendix C</a>.  Changes from <a href="./rfc5988">RFC 5988</a>  . . . . . . . . . . . . . . .  <a href="#page-24">24</a>
+   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  <a href="#page-24">24</a>
+
+
+
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+<span class="grey">Nottingham                   Standards Track                    [Page 3]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-4" id="page-4" href="#page-4" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+<span class="h2"><a class="selflink" name="section-1" href="#section-1">1</a>.  Introduction</span>
+
+   This specification defines a model for the relationships between
+   resources on the Web ("links") and the type of those relationships
+   ("link relation types").
+
+   HTML [<a href="#ref-W3C.REC-html5-20141028" title="&quot;HTML5&quot;">W3C.REC-html5-20141028</a>] and Atom [<a href="./rfc4287" title="&quot;The Atom Syndication Format&quot;">RFC4287</a>] both have well-
+   defined concepts of linking; <a href="#section-2">Section 2</a> generalises this into a
+   framework that encompasses linking in these formats and (potentially)
+   elsewhere.
+
+   Furthermore, <a href="#section-3">Section 3</a> defines an HTTP header field for conveying
+   such links.
+
+<span class="h3"><a class="selflink" name="section-1.1" href="#section-1.1">1.1</a>.  Notational Conventions</span>
+
+   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
+   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
+   "OPTIONAL" in this document are to be interpreted as described in <a href="./bcp14">BCP</a>
+   <a href="./bcp14">14</a> [<a href="./rfc2119" title="&quot;Key words for use in RFCs to Indicate Requirement Levels&quot;">RFC2119</a>] [<a href="./rfc8174" title="&quot;Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words&quot;">RFC8174</a>] when, and only when, they appear in all
+   capitals, as shown here.
+
+   This document uses the Augmented Backus-Naur Form (ABNF) [<a href="./rfc5234" title="&quot;Augmented BNF for Syntax Specifications: ABNF&quot;">RFC5234</a>]
+   notation of [<a href="./rfc7230" title="&quot;Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing&quot;">RFC7230</a>], including the #rule, and explicitly includes
+   the following rules from it: quoted-string, token, SP (space), BWS
+   (bad whitespace), OWS (optional whitespace), RWS (required
+   whitespace), LOALPHA, DIGIT.
+
+   Additionally, the following rules are included:
+
+   o  URI and URI-Reference from [<a href="./rfc3986" title="&quot;Uniform Resource Identifier (URI): Generic Syntax&quot;">RFC3986</a>],
+   o  type-name and subtype-name from [<a href="./rfc6838" title="&quot;Media Type Specifications and Registration Procedures&quot;">RFC6838</a>],
+   o  media-query-list from [<a href="#ref-W3C.REC-css3-mediaqueries-20120619" title="&quot;Media Queries&quot;">W3C.REC-css3-mediaqueries-20120619</a>], and
+   o  Language-Tag from [<a href="./rfc5646" title="&quot;Tags for Identifying Languages&quot;">RFC5646</a>].
+
+<span class="h3"><a class="selflink" name="section-1.2" href="#section-1.2">1.2</a>.  Conformance and Error Handling</span>
+
+   The requirements regarding conformance and error handling highlighted
+   in <a href="./rfc7230#section-2.5">[RFC7230], Section&nbsp;2.5</a> apply to this document.
+
+
+
+
+
+
+
+
+
+
+
+
+<span class="grey">Nottingham                   Standards Track                    [Page 4]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-5" id="page-5" href="#page-5" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+<span class="h2"><a class="selflink" name="section-2" href="#section-2">2</a>.  Links</span>
+
+   In this specification, a link is a typed connection between two
+   resources and is comprised of:
+
+   o  a link context,
+   o  a link relation type (<a href="#section-2.1">Section 2.1</a>),
+   o  a link target, and
+   o  optionally, target attributes (<a href="#section-2.2">Section 2.2</a>).
+
+   A link can be viewed as a statement of the form "link context has a
+   link relation type resource at link target, which has target
+   attributes".
+
+   For example, "https://www.example.com/" has a "canonical" resource at
+   "https://example.com", which has a "type" of "text/html".
+
+   Link contexts and link targets are both Internationalized Resource
+   Identifiers (IRIs) [<a href="./rfc3987" title="&quot;Internationalized Resource Identifiers (IRIs)&quot;">RFC3987</a>].  However, in the common case, the link
+   context will also be a URI [<a href="./rfc3986" title="&quot;Uniform Resource Identifier (URI): Generic Syntax&quot;">RFC3986</a>], because many protocols (such as
+   HTTP) do not support dereferencing IRIs.  Likewise, the link target
+   will sometimes be converted to a URI (see <a href="./rfc3987#section-3.1">[RFC3987], Section&nbsp;3.1</a>) in
+   serialisations that do not support IRIs (such as the Link header
+   field defined in <a href="#section-3">Section 3</a>).
+
+   This specification does not place restrictions on the cardinality of
+   links; there can be multiple links to and from a particular target
+   and multiple links of the same or different types between a given
+   context and target.  Likewise, the relative ordering of links in any
+   particular serialisation, or between serialisations (e.g., the Link
+   header field and in-content links), is not specified or significant
+   in this specification; applications that wish to consider ordering
+   significant can do so.
+
+   Links are conveyed in link serialisations; they are the "bytes on the
+   wire", and can occur in various forms.  For example, Atom [<a href="./rfc4287" title="&quot;The Atom Syndication Format&quot;">RFC4287</a>]
+   and HTML [<a href="#ref-W3C.REC-html5-20141028" title="&quot;HTML5&quot;">W3C.REC-html5-20141028</a>] both defined serialisations of
+   links into their respective formats, and <a href="#section-3">Section 3</a> defines how to
+   serialise links in HTTP header fields.
+
+   This specification does not define a general syntax for links across
+   different serialisations, nor does it mandate a specific context for
+   any given link; it is expected that serialisations of links will
+   specify both aspects.
+
+   Finally, links are used by link applications.  Generally, an
+   application will define the link relation type(s) it uses, along with
+   the serialisation(s) that they might occur within.  For example, the
+
+
+
+<span class="grey">Nottingham                   Standards Track                    [Page 5]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-6" id="page-6" href="#page-6" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+   application "Web browsing" looks for the "stylesheet" link relation
+   type in the HTML link serialisation (and optionally in the Link
+   header field), whereas the application "AtomPub" uses the "edit" and
+   "edit-media" link relations in the Atom serialisation.
+
+<span class="h3"><a class="selflink" name="section-2.1" href="#section-2.1">2.1</a>.  Link Relation Types</span>
+
+   In the simplest case, a link relation type identifies the semantics
+   of a link.  For example, a link with the relation type "copyright"
+   indicates that the current link context has a copyright resource at
+   the link target.
+
+   Link relation types can also be used to indicate that the target
+   resource has particular attributes, or exhibits particular
+   behaviours; for example, a "service" link implies that the link
+   target can be used as part of a defined protocol (in this case, a
+   service description).
+
+   Relation types are not to be confused with media types [<a href="./rfc2046" title="&quot;Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types&quot;">RFC2046</a>];
+   they do not identify the format of the representation that results
+   when the link is dereferenced.  Rather, they only describe how the
+   current context is related to another resource.
+
+   Relation types SHOULD NOT infer any additional semantics based upon
+   the presence or absence of another link relation type, or its own
+   cardinality of occurrence.  An exception to this is the combination
+   of the "alternate" and "stylesheet" registered relation types, which
+   has special meaning in HTML for historical reasons.
+
+   There are two kinds of relation types: registered and extension.
+
+<span class="h4"><a class="selflink" name="section-2.1.1" href="#section-2.1.1">2.1.1</a>.  Registered Relation Types</span>
+
+   Well-defined relation types can be registered as tokens for
+   convenience and/or to promote reuse by other applications, using the
+   procedure in <a href="#section-2.1.1.1">Section 2.1.1.1</a>.
+
+   Registered relation type names MUST conform to the reg-rel-type rule
+   (see <a href="#section-3.3">Section 3.3</a>) and MUST be compared character by character in a
+   case-insensitive fashion.  They SHOULD be appropriate to the
+   specificity of the relation type; that is, if the semantics are
+   highly specific to a particular application, the name should reflect
+   that, so that more general names are available for less-specific use.
+
+   Registered relation types MUST NOT constrain the media type of the
+   link context and MUST NOT constrain the available representation
+   media types of the link target.  However, they can specify the
+   behaviours and properties of the target resource (e.g., allowable
+
+
+
+<span class="grey">Nottingham                   Standards Track                    [Page 6]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-7" id="page-7" href="#page-7" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+   HTTP methods, and request and response media types that are required
+   be supported).
+
+   Historically, registered relation types have been identified with a
+   URI [<a href="./rfc3986" title="&quot;Uniform Resource Identifier (URI): Generic Syntax&quot;">RFC3986</a>] by prefixing their names with an application-defined
+   base URI (e.g., see <a href="#appendix-A.2">Appendix A.2</a>).  This practice is NOT RECOMMENDED,
+   because the resulting strings will not be considered equivalent to
+   the registered relation types by other applications.  Applications
+   that do use such URIs internally MUST NOT use them in link
+   serialisations that do not explicitly accommodate them.
+
+<span class="h5"><a class="selflink" name="section-2.1.1.1" href="#section-2.1.1.1">2.1.1.1</a>.  Registering Link Relation Types</span>
+
+   The "Link Relations" registry is located at
+   &lt;<a href="https://www.iana.org/assignments/link-relations/">https://www.iana.org/assignments/link-relations/</a>&gt;.  Registration
+   requests can be made by following the instructions located there or
+   by sending an email to the &lt;link-relations@ietf.org&gt; mailing list.
+
+   Registration requests consist of at least the following information:
+
+   o  *Relation Name*: The name of the relation type
+
+   o  *Description*: A short English description of the type's
+      semantics.  It SHOULD be stated in terms of the relationship
+      between the link context and link target.
+
+   o  *Reference*: Reference to the document that specifies the link
+      relation type, preferably including a URI that can be used to
+      retrieve a copy of the document.  An indication of the relevant
+      section(s) can also be included but is not required.
+
+   The expert(s) can define additional fields to be collected in the
+   registry.
+
+   General requirements for registered relation types are described in
+   <a href="#section-2.1.1">Section 2.1.1</a>.
+
+   Registrations MUST reference a freely available, stable
+   specification.
+
+   Note that relation types can be registered by third parties
+   (including the expert(s)), if the expert(s) determines that an
+   unregistered relation type is widely deployed and not likely to be
+   registered in a timely manner otherwise.  Such registrations still
+   are subject to the requirements defined, including the need to
+   reference a specification.
+
+
+
+
+
+<span class="grey">Nottingham                   Standards Track                    [Page 7]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-8" id="page-8" href="#page-8" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+<span class="h5"><a class="selflink" name="section-2.1.1.2" href="#section-2.1.1.2">2.1.1.2</a>.  Registration Request Processing</span>
+
+   Relation types are registered using the Specification Required policy
+   (see <a href="./rfc8126#section-4.6">Section&nbsp;4.6 of [RFC8126]</a>), which implies review and approval by
+   a designated expert.
+
+   The goal of the registry is to reflect common use of links on the
+   Internet.  Therefore, the expert(s) should be strongly biased towards
+   approving registrations, unless they are abusive, frivolous, not
+   likely to be used on the Internet, or actively harmful to the
+   Internet and/or the Web (not merely aesthetically displeasing or
+   architecturally dubious).  As stated in <a href="#section-2.1.1">Section 2.1.1</a>, the expert(s)
+   can withhold registration of names that are too general for the
+   proposed application.
+
+   The expert(s) will clearly identify any issues that cause a
+   registration to be refused.  Advice about the semantics of a proposed
+   link relation type can be given, but if it does not block
+   registration, this should be explicitly stated.
+
+   When a request is approved, the expert(s) will inform IANA, and the
+   registration will be processed.  The IESG is the final arbiter of any
+   objection.
+
+<span class="h4"><a class="selflink" name="section-2.1.2" href="#section-2.1.2">2.1.2</a>.  Extension Relation Types</span>
+
+   Applications that don't wish to register a relation type can use an
+   extension relation type, which is a URI [<a href="./rfc3986" title="&quot;Uniform Resource Identifier (URI): Generic Syntax&quot;">RFC3986</a>] that uniquely
+   identifies the relation type.  Although the URI can point to a
+   resource that contains a definition of the semantics of the relation
+   type, clients SHOULD NOT automatically access that resource to avoid
+   overburdening its server.
+
+   The URI used for an extension relation type SHOULD be under the
+   control of the person or party defining it or be delegated to them.
+
+   When extension relation types are compared, they MUST be compared as
+   strings (after converting to URIs if serialised in a different
+   format) in a case-insensitive fashion, character by character.
+   Because of this, all-lowercase URIs SHOULD be used for extension
+   relations.
+
+   Note that while extension relation types are required to be URIs, a
+   serialisation of links can specify that they are expressed in another
+   form, as long as they can be converted to URIs.
+
+
+
+
+
+
+<span class="grey">Nottingham                   Standards Track                    [Page 8]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-9" id="page-9" href="#page-9" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+<span class="h3"><a class="selflink" name="section-2.2" href="#section-2.2">2.2</a>.  Target Attributes</span>
+
+   Target attributes are a list of key/value pairs that describe the
+   link or its target; for example, a media type hint.
+
+   They can be defined both by individual link relation types and by
+   link serialisations.
+
+   This specification does not attempt to coordinate the name of target
+   attributes, their cardinality, or use.  Those creating and
+   maintaining serialisations SHOULD coordinate their target attributes
+   to avoid conflicts in semantics or syntax and MAY define their own
+   registries of target attributes.
+
+   The names of target attributes SHOULD conform to the token rule, but
+   SHOULD NOT include any of the characters "%", "'", or "*", for
+   portability across serialisations and MUST be compared in a case-
+   insensitive fashion.
+
+   Target attribute definitions SHOULD specify:
+
+   o  The serialisation of their values into Unicode or a subset
+      thereof, to maximise their chances of portability across link
+      serialisations.
+   o  The semantics and error handling of multiple occurrences of the
+      target attribute on a given link.
+
+   This specification does define target attributes for use in the Link
+   HTTP header field in <a href="#section-3.4">Section 3.4</a>.
+
+<span class="h2"><a class="selflink" name="section-3" href="#section-3">3</a>.  Link Serialisation in HTTP Headers</span>
+
+   The Link header field provides a means for serialising one or more
+   links into HTTP headers.
+
+   The ABNF for the field value is:
+
+     Link       = #link-value
+     link-value = "&lt;" URI-Reference "&gt;" *( OWS ";" OWS link-param )
+     link-param = token BWS [ "=" BWS ( token / quoted-string ) ]
+
+   Note that any link-param can be generated with values using either
+   the token or the quoted-string syntax; therefore, recipients MUST be
+   able to parse both forms.  In other words, the following parameters
+   are equivalent:
+
+     x=y
+     x="y"
+
+
+
+<span class="grey">Nottingham                   Standards Track                    [Page 9]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-10" id="page-10" href="#page-10" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+   Previous definitions of the Link header did not equate the token and
+   quoted-string forms explicitly; the title parameter was always
+   quoted, and the hreflang parameter was always a token.  Senders
+   wishing to maximize interoperability will send them in those forms.
+
+   Individual link-params specify their syntax in terms of the value
+   after any necessary unquoting (as per <a href="./rfc7230#section-3.2.6">[RFC7230], Section&nbsp;3.2.6</a>).
+
+   This specification establishes the link-params "rel", "anchor", and
+   "rev" (which are part of the general link model), as well as
+   "hreflang", "media", "title", "title*", and "type" (which are target
+   attributes defined by the serialisation).
+
+<span class="h3"><a class="selflink" name="section-3.1" href="#section-3.1">3.1</a>.  Link Target</span>
+
+   Each link-value conveys one target IRI as a URI-Reference (after
+   conversion to one, if necessary; see <a href="./rfc3987#section-3.1">[RFC3987], Section&nbsp;3.1</a>) inside
+   angle brackets ("&lt;&gt;").  If the URI-Reference is relative, parsers
+   MUST resolve it as per <a href="./rfc3986#section-5">[RFC3986], Section&nbsp;5</a>.  Note that any base IRI
+   appearing in the message's content is not applied.
+
+<span class="h3"><a class="selflink" name="section-3.2" href="#section-3.2">3.2</a>.  Link Context</span>
+
+   By default, the context of a link conveyed in the Link header field
+   is the URL of the representation it is associated with, as defined in
+   <a href="./rfc7231#section-3.1.4.1">[RFC7231], Section&nbsp;3.1.4.1</a>, and is serialised as a URI.
+
+   When present, the anchor parameter overrides this with another URI,
+   such as a fragment of this resource, or a third resource (i.e., when
+   the anchor value is an absolute URI).  If the anchor parameter's
+   value is a relative URI, parsers MUST resolve it as per <a href="./rfc3986#section-5">[RFC3986],
+   Section&nbsp;5</a>.  Note that any base URI from the body's content is not
+   applied.
+
+   The ABNF for the "anchor" parameter's value is:
+
+     URI-Reference ; <a href="./rfc3986#section-4.1">Section&nbsp;4.1 of [RFC3986]</a>
+
+   Link application can choose to ignore links with an anchor parameter.
+   For example, the application in use might not allow the link context
+   to be assigned to a different resource.  In such cases, the entire
+   link is to be ignored; link applications MUST NOT process the link
+   without applying the anchor.
+
+   Note that depending on HTTP status code and response headers, the
+   link context might be "anonymous" (i.e., no link context is
+   available).  For example, this is the case on a 404 response to a GET
+   request.
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 10]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-11" id="page-11" href="#page-11" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+<span class="h3"><a class="selflink" name="section-3.3" href="#section-3.3">3.3</a>.  Relation Type</span>
+
+   The relation type of a link conveyed in the Link header field is
+   conveyed in the "rel" parameter's value.  The rel parameter MUST be
+   present but MUST NOT appear more than once in a given link-value;
+   occurrences after the first MUST be ignored by parsers.
+
+   The rel parameter can, however, contain multiple link relation types.
+   When this occurs, it establishes multiple links that share the same
+   context, target, and target attributes.
+
+   The "rev" parameter has been used in the past to indicate that the
+   semantics of the relationship are in the reverse direction.  That is,
+   a link from A to B with REL="X" expresses the same relationship as a
+   link from B to A with REV="X". rev is deprecated by this
+   specification because it often confuses authors and readers; in most
+   cases, using a separate relation type is preferable.
+
+   The ABNF for the rel and rev parameters' values is:
+
+     relation-type *( 1*SP relation-type )
+
+   where:
+
+     relation-type  = reg-rel-type / ext-rel-type
+     reg-rel-type   = LOALPHA *( LOALPHA / DIGIT / "." / "-" )
+     ext-rel-type   = URI ; <a href="./rfc3986#section-3">Section&nbsp;3 of [RFC3986]</a>
+
+   Note that extension relation types are REQUIRED to be absolute URIs
+   in Link header fields and MUST be quoted when they contain characters
+   not allowed in tokens, such as a semicolon (";") or comma (",") (as
+   these characters are used as delimiters in the header field itself).
+
+<span class="h3"><a class="selflink" name="section-3.4" href="#section-3.4">3.4</a>.  Target Attributes</span>
+
+   The Link header field defines several target attributes specific to
+   this serialisation and also allows extension target attributes.
+   Target attributes are serialised in the Link header field as
+   parameters (see <a href="./rfc7231#section-3.1.1.1">[RFC7231], Section&nbsp;3.1.1.1</a> for the definition of
+   their syntax).
+
+<span class="h4"><a class="selflink" name="section-3.4.1" href="#section-3.4.1">3.4.1</a>.  Serialisation-Defined Attributes</span>
+
+   The "hreflang", "media", "title", "title*", and "type" link-params
+   can be translated to serialisation-defined target attributes for the
+   link.
+
+
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 11]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-12" id="page-12" href="#page-12" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+   The "hreflang" attribute, when present, is a hint indicating what the
+   language of the result of dereferencing the link should be.  Note
+   that this is only a hint; for example, it does not override the
+   Content-Language header field of a HTTP response obtained by actually
+   following the link.  Multiple hreflang attributes on a single link-
+   value indicate that multiple languages are available from the
+   indicated resource.
+
+   The ABNF for the hreflang parameter's value is:
+
+     Language-Tag
+
+   The "media" attribute, when present, is used to indicate intended
+   destination medium or media for style information (see
+   [<a href="#ref-W3C.REC-html5-20141028" title="&quot;HTML5&quot;">W3C.REC-html5-20141028</a>], Section 4.2.4).  Its value MUST be quoted
+   if it contains a semicolon (";") or comma (",").  There MUST NOT be
+   more than one media attribute in a link-value; occurrences after the
+   first MUST be ignored by parsers.
+
+   The ABNF for the media parameter's value is:
+
+     media-query-list
+
+   The "title" attribute, when present, is used to label the destination
+   of a link such that it can be used as a human-readable identifier
+   (e.g., a menu entry) in the language indicated by the Content-
+   Language header field (if present).  The title attribute MUST NOT
+   appear more than once in a given link; occurrences after the first
+   MUST be ignored by parsers.
+
+   The "title*" link-param can be used to encode this attribute in a
+   different character set and/or contain language information as per
+   [<a href="./rfc8187" title="&quot;Indicating Character Encoding and Language for HTTP Header Field Parameters&quot;">RFC8187</a>].  The title* link-param MUST NOT appear more than once in a
+   given link-value; occurrences after the first MUST be ignored by
+   parsers.  If the attribute does not contain language information, its
+   language is indicated by the Content-Language header field (when
+   present).
+
+   If both the title and title* link-params appear in a link,
+   applications SHOULD use the title* link-param's value for the title
+   attribute.
+
+   The "type" attribute, when present, is a hint indicating what the
+   media type of the result of dereferencing the link should be.  Note
+   that this is only a hint; for example, it does not override the
+   Content-Type header field of a HTTP response obtained by actually
+
+
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 12]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-13" id="page-13" href="#page-13" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+   following the link.  The type attribute MUST NOT appear more than
+   once in a given link-value; occurrences after the first MUST be
+   ignored by parsers.
+
+   The ABNF for the type parameter's value is:
+
+     type-name "/" subtype-name ; see <a href="./rfc6838#section-4.2">Section&nbsp;4.2 of [RFC6838]</a>
+
+<span class="h4"><a class="selflink" name="section-3.4.2" href="#section-3.4.2">3.4.2</a>.  Extension Attributes</span>
+
+   Other link-params are link-extensions and are to be considered as
+   target attributes.
+
+   Such target attributes MAY be defined to use the encoding in
+   [<a href="./rfc8187" title="&quot;Indicating Character Encoding and Language for HTTP Header Field Parameters&quot;">RFC8187</a>] (e.g., "example" and "example*").  When both forms are
+   present, they SHOULD be considered to be the same target attribute;
+   applications SHOULD use the value of the name ending in "*" (after
+   [<a href="./rfc8187" title="&quot;Indicating Character Encoding and Language for HTTP Header Field Parameters&quot;">RFC8187</a>] decoding) but MAY fall back to the other value if there is
+   an error in decoding it, or if they do not support decoding.
+
+<span class="h3"><a class="selflink" name="section-3.5" href="#section-3.5">3.5</a>.  Link Header Field Examples</span>
+
+   For example:
+
+   Link: &lt;http://example.com/TheBook/chapter2&gt;; rel="previous";
+         title="previous chapter"
+
+   indicates that "chapter2" is previous to this resource in a logical
+   navigation path.
+
+   Similarly,
+
+   Link: &lt;/&gt;; rel="http://example.net/foo"
+
+   indicates that the root resource ("/") is related to this resource
+   with the extension relation type "http://example.net/foo".
+
+   This link:
+
+   Link: &lt;/terms&gt;; rel="copyright"; anchor="#foo"
+
+   indicates that the linked copyright terms only apply to the portion
+   of the document indicated by the (media type-specific) fragment
+   identifier "foo".
+
+   The example below shows an instance of the Link header field encoding
+   multiple links and also the use of the encoding from <a href="./rfc8187">RFC 8187</a> to
+   encode both non-ASCII characters and language information.
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 13]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-14" id="page-14" href="#page-14" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+   Link: &lt;/TheBook/chapter2&gt;;
+         rel="previous"; title*=UTF-8'de'letztes%20Kapitel,
+         &lt;/TheBook/chapter4&gt;;
+         rel="next"; title*=UTF-8'de'n%c3%a4chstes%20Kapitel
+
+   Here, both links have titles encoded in UTF-8, both use the German
+   language ("de"), and the second link contains the Unicode code point
+   U+00E4 ("LATIN SMALL LETTER A WITH DIAERESIS").
+
+   Note that link-values can convey multiple links between the same link
+   target and link context; for example:
+
+   Link: &lt;http://example.org/&gt;;
+         rel="start http://example.net/relation/other"
+
+   Here, the link to "http://example.org/" has the registered relation
+   type "start" and the extension relation type
+   "http://example.net/relation/other".
+
+   Finally, this header field:
+
+   Link: &lt;https://example.org/&gt;; rel="start",
+         &lt;https://example.org/index&gt;; rel="index"
+
+   is equivalent to these:
+
+   Link: &lt;https://example.org/&gt;; rel="start"
+   Link: &lt;https://example.org/index&gt;; rel="index"
+
+<span class="h2"><a class="selflink" name="section-4" href="#section-4">4</a>.  IANA Considerations</span>
+
+<span class="h3"><a class="selflink" name="section-4.1" href="#section-4.1">4.1</a>.  Link HTTP Header Field Registration</span>
+
+   This specification updates the "Message Headers" registry entry for
+   "Link" in HTTP [<a href="./rfc3864" title="&quot;Registration Procedures for Message Header Fields&quot;">RFC3864</a>] to refer to this document.
+
+   Header Field Name: Link
+   Protocol: http
+   Status: standard
+   Reference: <a href="./rfc8288">RFC 8288</a>
+
+<span class="h3"><a class="selflink" name="section-4.2" href="#section-4.2">4.2</a>.  Link Relation Type Registry</span>
+
+   This specification updates the registration procedures for the "Link
+   Relation Types" registry; see <a href="#section-2.1.1.1">Section 2.1.1.1</a>.  Also, all references
+   to <a href="./rfc5988">RFC 5988</a> in that registry have been replaced with references to
+   this document.
+
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 14]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-15" id="page-15" href="#page-15" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+   IANA will direct any incoming requests regarding the registry to this
+   document and, if defined, the processes established by the expert(s);
+   typically, this will mean referring them to the registry Web page.
+
+   Note that the expert(s) is allowed (as per <a href="#section-2.1.1.1">Section 2.1.1.1</a>) to define
+   additional fields to be collected in the registry.
+
+<span class="h3"><a class="selflink" name="section-4.3" href="#section-4.3">4.3</a>.  Link Relation Application Data Registry</span>
+
+   Per this specification, IANA has removed the "Link Relation
+   Application Data" registry, as it has not been used, and future use
+   is not anticipated.
+
+<span class="h2"><a class="selflink" name="section-5" href="#section-5">5</a>.  Security Considerations</span>
+
+   The content of the Link header field is not secure, private, or
+   integrity-guaranteed.  Use of Transport Layer Security (TLS) with
+   HTTP [<a href="./rfc2818" title="&quot;HTTP Over TLS&quot;">RFC2818</a>] is currently the only end-to-end way to provide these
+   properties.
+
+   Link applications ought to consider the attack vectors opened by
+   automatically following, trusting, or otherwise using links gathered
+   from HTTP header fields.
+
+   For example, Link header fields that use the "anchor" parameter to
+   associate a link's context with another resource cannot be trusted
+   since they are effectively assertions by a third party that could be
+   incorrect or malicious.  Applications can mitigate this risk by
+   specifying that such links should be discarded unless some
+   relationship between the resources is established (e.g., they share
+   the same authority).
+
+   Dereferencing links has a number of risks, depending on the
+   application in use.  For example, the Referer header [<a href="./rfc7231" title="&quot;Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content&quot;">RFC7231</a>] can
+   expose information about the application's state (including private
+   information) in its value.  Likewise, cookies [<a href="./rfc6265" title="&quot;HTTP State Management Mechanism&quot;">RFC6265</a>] are another
+   mechanism that, if used, can become an attack vector.  Applications
+   can mitigate these risks by carefully specifying how such mechanisms
+   should operate.
+
+   The Link header field makes extensive use of IRIs and URIs.  See
+   <a href="./rfc3987#section-8">[RFC3987], Section&nbsp;8</a> for security considerations relating to IRIs.
+   See <a href="./rfc3986#section-7">[RFC3986], Section&nbsp;7</a> for security considerations relating to
+   URIs.  See <a href="./rfc7230#section-9">[RFC7230], Section&nbsp;9</a> for security considerations relating
+   to HTTP header fields.
+
+
+
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 15]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-16" id="page-16" href="#page-16" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+<span class="h2"><a class="selflink" name="section-6" href="#section-6">6</a>.  Internationalisation Considerations</span>
+
+   Link targets may need to be converted to URIs in order to express
+   them in serialisations that do not support IRIs.  This includes the
+   Link HTTP header field.
+
+   Similarly, the anchor parameter of the Link header field does not
+   support IRIs; therefore, IRIs must be converted to URIs before
+   inclusion there.
+
+   Relation types are defined as URIs, not IRIs, to aid in their
+   comparison.  It is not expected that they will be displayed to end
+   users.
+
+   Note that registered Relation Names are required to be lowercase
+   ASCII letters.
+
+<span class="h2"><a class="selflink" name="section-7" href="#section-7">7</a>.  References</span>
+
+<span class="h3"><a class="selflink" name="section-7.1" href="#section-7.1">7.1</a>.  Normative References</span>
+
+   [<a name="ref-RFC2119" id="ref-RFC2119">RFC2119</a>]  Bradner, S., "Key words for use in RFCs to Indicate
+              Requirement Levels", <a href="./bcp14">BCP 14</a>, <a href="./rfc2119">RFC 2119</a>,
+              DOI 10.17487/RFC2119, March 1997,
+              &lt;<a href="https://www.rfc-editor.org/info/rfc2119">https://www.rfc-editor.org/info/rfc2119</a>&gt;.
+
+   [<a name="ref-RFC3864" id="ref-RFC3864">RFC3864</a>]  Klyne, G., Nottingham, M., and J. Mogul, "Registration
+              Procedures for Message Header Fields", <a href="./bcp90">BCP 90</a>, <a href="./rfc3864">RFC 3864</a>,
+              DOI 10.17487/RFC3864, September 2004,
+              &lt;<a href="https://www.rfc-editor.org/info/rfc3864">https://www.rfc-editor.org/info/rfc3864</a>&gt;.
+
+   [<a name="ref-RFC3986" id="ref-RFC3986">RFC3986</a>]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
+              Resource Identifier (URI): Generic Syntax", STD 66,
+              <a href="./rfc3986">RFC 3986</a>, DOI 10.17487/RFC3986, January 2005,
+              &lt;<a href="https://www.rfc-editor.org/info/rfc3986">https://www.rfc-editor.org/info/rfc3986</a>&gt;.
+
+   [<a name="ref-RFC3987" id="ref-RFC3987">RFC3987</a>]  Duerst, M. and M. Suignard, "Internationalized Resource
+              Identifiers (IRIs)", <a href="./rfc3987">RFC 3987</a>, DOI 10.17487/RFC3987,
+              January 2005, &lt;<a href="https://www.rfc-editor.org/info/rfc3987">https://www.rfc-editor.org/info/rfc3987</a>&gt;.
+
+   [<a name="ref-RFC5234" id="ref-RFC5234">RFC5234</a>]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
+              Specifications: ABNF", STD 68, <a href="./rfc5234">RFC 5234</a>,
+              DOI 10.17487/RFC5234, January 2008,
+              &lt;<a href="https://www.rfc-editor.org/info/rfc5234">https://www.rfc-editor.org/info/rfc5234</a>&gt;.
+
+   [<a name="ref-RFC5646" id="ref-RFC5646">RFC5646</a>]  Phillips, A., Ed. and M. Davis, Ed., "Tags for Identifying
+              Languages", <a href="./bcp47">BCP 47</a>, <a href="./rfc5646">RFC 5646</a>, DOI 10.17487/RFC5646,
+              September 2009, &lt;<a href="https://www.rfc-editor.org/info/rfc5646">https://www.rfc-editor.org/info/rfc5646</a>&gt;.
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 16]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-17" id="page-17" href="#page-17" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+   [<a name="ref-RFC6838" id="ref-RFC6838">RFC6838</a>]  Freed, N., Klensin, J., and T. Hansen, "Media Type
+              Specifications and Registration Procedures", <a href="./bcp13">BCP 13</a>,
+              <a href="./rfc6838">RFC 6838</a>, DOI 10.17487/RFC6838, January 2013,
+              &lt;<a href="https://www.rfc-editor.org/info/rfc6838">https://www.rfc-editor.org/info/rfc6838</a>&gt;.
+
+   [<a name="ref-RFC7230" id="ref-RFC7230">RFC7230</a>]  Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer
+              Protocol (HTTP/1.1): Message Syntax and Routing",
+              <a href="./rfc7230">RFC 7230</a>, DOI 10.17487/RFC7230, June 2014,
+              &lt;<a href="https://www.rfc-editor.org/info/rfc7230">https://www.rfc-editor.org/info/rfc7230</a>&gt;.
+
+   [<a name="ref-RFC7231" id="ref-RFC7231">RFC7231</a>]  Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer
+              Protocol (HTTP/1.1): Semantics and Content", <a href="./rfc7231">RFC 7231</a>,
+              DOI 10.17487/RFC7231, June 2014,
+              &lt;<a href="https://www.rfc-editor.org/info/rfc7231">https://www.rfc-editor.org/info/rfc7231</a>&gt;.
+
+   [<a name="ref-RFC8126" id="ref-RFC8126">RFC8126</a>]  Cotton, M., Leiba, B., and T. Narten, "Guidelines for
+              Writing an IANA Considerations Section in RFCs", <a href="./bcp26">BCP 26</a>,
+              <a href="./rfc8126">RFC 8126</a>, DOI 10.17487/RFC8126, June 2017,
+              &lt;<a href="https://www.rfc-editor.org/info/rfc8126">https://www.rfc-editor.org/info/rfc8126</a>&gt;.
+
+   [<a name="ref-RFC8174" id="ref-RFC8174">RFC8174</a>]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in <a href="./rfc2119">RFC</a>
+              <a href="./rfc2119">2119</a> Key Words", <a href="./bcp14">BCP 14</a>, <a href="./rfc8174">RFC 8174</a>, DOI 10.17487/RFC8174,
+              May 2017, &lt;<a href="https://www.rfc-editor.org/info/rfc8174">https://www.rfc-editor.org/info/rfc8174</a>&gt;.
+
+   [<a name="ref-RFC8187" id="ref-RFC8187">RFC8187</a>]  Reschke, J., "Indicating Character Encoding and Language
+              for HTTP Header Field Parameters", <a href="./rfc8187">RFC 8187</a>,
+              DOI 10.17487/RFC8187, September 2017,
+              &lt;<a href="https://www.rfc-editor.org/info/rfc8187">https://www.rfc-editor.org/info/rfc8187</a>&gt;.
+
+   [<a name="ref-W3C.REC-css3-mediaqueries-20120619" id="ref-W3C.REC-css3-mediaqueries-20120619">W3C.REC-css3-mediaqueries-20120619</a>]
+              Rivoal, F., "Media Queries", W3C Recommendation
+              REC-css3-mediaqueries-20120619, June 2012,
+              &lt;<a href="http://www.w3.org/TR/2012/REC-css3-mediaqueries-20120619">http://www.w3.org/TR/2012/</a>
+              <a href="http://www.w3.org/TR/2012/REC-css3-mediaqueries-20120619">REC-css3-mediaqueries-20120619</a>&gt;.
+
+<span class="h3"><a class="selflink" name="section-7.2" href="#section-7.2">7.2</a>.  Informative References</span>
+
+   [<a name="ref-RFC2046" id="ref-RFC2046">RFC2046</a>]  Freed, N. and N. Borenstein, "Multipurpose Internet Mail
+              Extensions (MIME) Part Two: Media Types", <a href="./rfc2046">RFC 2046</a>,
+              DOI 10.17487/RFC2046, November 1996,
+              &lt;<a href="https://www.rfc-editor.org/info/rfc2046">https://www.rfc-editor.org/info/rfc2046</a>&gt;.
+
+   [<a name="ref-RFC2818" id="ref-RFC2818">RFC2818</a>]  Rescorla, E., "HTTP Over TLS", <a href="./rfc2818">RFC 2818</a>,
+              DOI 10.17487/RFC2818, May 2000,
+              &lt;<a href="https://www.rfc-editor.org/info/rfc2818">https://www.rfc-editor.org/info/rfc2818</a>&gt;.
+
+
+
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 17]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-18" id="page-18" href="#page-18" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+   [<a name="ref-RFC4287" id="ref-RFC4287">RFC4287</a>]  Nottingham, M., Ed. and R. Sayre, Ed., "The Atom
+              Syndication Format", <a href="./rfc4287">RFC 4287</a>, DOI 10.17487/RFC4287,
+              December 2005, &lt;<a href="https://www.rfc-editor.org/info/rfc4287">https://www.rfc-editor.org/info/rfc4287</a>&gt;.
+
+   [<a name="ref-RFC6265" id="ref-RFC6265">RFC6265</a>]  Barth, A., "HTTP State Management Mechanism", <a href="./rfc6265">RFC 6265</a>,
+              DOI 10.17487/RFC6265, April 2011,
+              &lt;<a href="https://www.rfc-editor.org/info/rfc6265">https://www.rfc-editor.org/info/rfc6265</a>&gt;.
+
+   [<a name="ref-W3C.REC-html5-20141028" id="ref-W3C.REC-html5-20141028">W3C.REC-html5-20141028</a>]
+              Hickson, I., Berjon, R., Faulkner, S., Leithead, T.,
+              Navara, E., O'Connor, T., and S. Pfeiffer, "HTML5", W3C
+              Recommendation REC-html5-20141028, October 2014,
+              &lt;<a href="http://www.w3.org/TR/2014/REC-html5-20141028">http://www.w3.org/TR/2014/REC-html5-20141028</a>&gt;.
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 18]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-19" id="page-19" href="#page-19" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+<span class="h2"><a class="selflink" name="appendix-A" href="#appendix-A">Appendix A</a>.  Notes on Other Link Serialisations</span>
+
+   Header fields (<a href="#section-3">Section 3</a>) are only one serialisation of links; other
+   specifications have defined alternative serialisations.
+
+<span class="h3"><a class="selflink" name="appendix-A.1" href="#appendix-A.1">A.1</a>.  Link Serialisation in HTML</span>
+
+   HTML motivated the original syntax of the Link header field, and many
+   of the design decisions in this document are driven by a desire to
+   stay compatible with it.
+
+   In HTML, the link element can be mapped to links as specified here by
+   using the "href" attribute for the target URI, and "rel" to convey
+   the relation type, as in the Link header field.  The context of the
+   link is the URI associated with the entire HTML document.  HTML also
+   defines several attributes on links that can be seen as target
+   attributes, including "media", "hreflang", "type", and "sizes".
+
+   <a href="#section-4.8">Section 4.8</a> of HTML5 [<a href="#ref-W3C.REC-html5-20141028" title="&quot;HTML5&quot;">W3C.REC-html5-20141028</a>] defines modern HTML
+   links.  That document links to the Microformats Wiki as a registry;
+   over time, the IANA registry ought to mirror its contents and,
+   ideally, eventually replace it (although that depends on the HTML
+   community).
+
+   Surveys of existing HTML content have shown that unregistered link
+   relation types that are not URIs are (perhaps inevitably) common.
+   Consuming HTML implementations ought not consider such unregistered
+   short links to be errors, but rather relation types with a local
+   scope (i.e., their meaning is specific and perhaps private to that
+   document).
+
+   Finally, the HTML specification gives a special meaning when the
+   "alternate" relation types coincide with other relation types in the
+   same link.  Such links ought to be serialised in the Link header
+   field using a single list of relation-types (e.g., rel="alternate
+   stylesheet") to preserve this relationship.
+
+<span class="h3"><a class="selflink" name="appendix-A.2" href="#appendix-A.2">A.2</a>.  Link Serialisation in Atom</span>
+
+   Atom [<a href="./rfc4287" title="&quot;The Atom Syndication Format&quot;">RFC4287</a>] is a link serialisation that conveys links in the
+   atom:link element, with the "href" attribute indicating the link
+   target and the "rel" attribute containing the relation type.  The
+   context of the link is either a feed locator or an entry ID,
+   depending on where it appears; generally, feed-level links are
+   obvious candidates for transmission as a Link header field.
+
+   When serialising an atom:link into a Link header field, it is
+   necessary to convert link targets (if used) to URIs.
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 19]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-20" id="page-20" href="#page-20" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+   Atom defines extension relation types in terms of IRIs.  This
+   specification redefines them as URIs, to simplify and reduce errors
+   in their comparison.
+
+   Atom allows registered link relation types to be serialised as
+   absolute URIs using a prefix, "<a href="http://www.iana.org/assignments/relation/">http://www.iana.org/assignments/</a>
+   <a href="http://www.iana.org/assignments/relation/">relation/</a>".  This prefix is specific to the Atom serialisation.
+
+   Furthermore, link relation types are always compared in a case-
+   sensitive fashion; therefore, registered link relation types SHOULD
+   be converted to their registered form (usually, lowercase) when
+   serialised in an Atom document.
+
+   Note also that while the Link header field allows multiple relations
+   to be serialised in a single link, atom:link does not.  In this case,
+   a single link-value may map to several atom:link elements.
+
+   As with HTML, atom:link defines some attributes that are not
+   explicitly mirrored in the Link header field syntax, but they can
+   also be used as link-extensions to maintain fidelity.
+
+<span class="h2"><a class="selflink" name="appendix-B" href="#appendix-B">Appendix B</a>.  Algorithms for Parsing Link Header Fields</span>
+
+   This appendix outlines a set of non-normative algorithms: for parsing
+   the Link header(s) out of a header set, for parsing a Link header
+   field value, and algorithms for parsing generic parts of the field
+   value.
+
+   These algorithms are more permissive than the ABNF defining the
+   syntax might suggest; the error handling embodied in them is a
+   reasonable approach, but not one that is required.  As such they are
+   advisory only, and in cases where there is disagreement, the correct
+   behaviour is defined by the body of this specification.
+
+<span class="h3"><a class="selflink" name="appendix-B.1" href="#appendix-B.1">B.1</a>.  Parsing a Header Set for Links</span>
+
+   This algorithm can be used to parse the Link header fields that a
+   HTTP header set contains.  Given a header_set of (string field_name,
+   string field_value) pairs, assuming ASCII encoding, it returns a list
+   of link objects.
+
+   1.  Let field_values be a list containing the members of header_set
+       whose field_name is a case-insensitive match for "link".
+
+   2.  Let links be an empty list.
+
+
+
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 20]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-21" id="page-21" href="#page-21" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+   3.  For each field_value in field_values:
+       1.  Let value_links be the result of Parsing a Link Field Value
+           (Appendix B.2) from field_value.
+       2.  Append each member of value_links to links.
+
+   4.  Return links.
+
+<span class="h3"><a class="selflink" name="appendix-B.2" href="#appendix-B.2">B.2</a>.  Parsing a Link Field Value</span>
+
+   This algorithm parses zero or more comma-separated link-values from a
+   Link header field.  Given a string field_value, assuming ASCII
+   encoding, it returns a list of link objects.
+
+   1.  Let links be an empty list.
+
+   2.  While field_value has content:
+       1.   Consume any leading OWS.
+       2.   If the first character is not "&lt;", return links.
+       3.   Discard the first character ("&lt;").
+       4.   Consume up to but not including the first "&gt;" character or
+            end of field_value and let the result be target_string.
+       5.   If the next character is not "&gt;", return links.
+       6.   Discard the leading "&gt;" character.
+       7.   Let link_parameters be the result of Parsing Parameters
+            (Appendix B.3) from field_value (consuming zero or more
+            characters of it).
+       8.   Let target_uri be the result of relatively resolving (as per
+            <a href="./rfc3986#section-5.2">[RFC3986], Section&nbsp;5.2</a>) target_string.  Note that any base
+            URI carried in the payload body is NOT used.
+       9.   Let relations_string be the second item of the first tuple
+            of link_parameters whose first item matches the string "rel"
+            or the empty string ("") if it is not present.
+       10.  Split relations_string on RWS (removing it in the process)
+            into a list of string relation_types.
+       11.  Let context_string be the second item of the first tuple of
+            link_parameters whose first item matches the string
+            "anchor".  If it is not present, context_string is the URL
+            of the representation carrying the Link header <a href="./rfc7231#section-3.1.4.1">[RFC7231],
+            Section&nbsp;3.1.4.1</a>, serialised as a URI.  Where the URL is
+            anonymous, context_string is null.
+       12.  Let context_uri be the result of relatively resolving (as
+            per <a href="./rfc3986#section-5.2">[RFC3986], Section&nbsp;5.2</a>) context_string, unless
+            context_string is null, in which case context is null.  Note
+            that any base URI carried in the payload body is NOT used.
+       13.  Let target_attributes be an empty list.
+
+
+
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 21]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-22" id="page-22" href="#page-22" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+       14.  For each tuple (param_name, param_value) of link_parameters:
+            1.  If param_name matches "rel" or "anchor", skip this
+                tuple.
+            2.  If param_name matches "media", "title", "title*", or
+                "type" and target_attributes already contains a tuple
+                whose first element matches the value of param_name,
+                skip this tuple.
+            3.  Append (param_name, param_value) to target_attributes.
+       15.  Let star_param_names be the set of param_names in the
+            (param_name, param_value) tuples of link_parameters where
+            the last character of param_name is an asterisk ("*").
+       16.  For each star_param_name in star_param_names:
+            1.  Let base_param_name be star_param_name with the last
+                character removed.
+            2.  If the implementation does not choose to support an
+                internationalised form of a parameter named
+                base_param_name for any reason (including, but not
+                limited to, it being prohibited by the parameter's
+                specification), remove all tuples from link_parameters
+                whose first member is star_param_name, and skip to the
+                next star_param_name.
+            3.  Remove all tuples from link_parameters whose first
+                member is base_param_name.
+            4.  Change the first member of all tuples in link_parameters
+                whose first member is star_param_name to
+                base_param_name.
+       17.  For each relation_type in relation_types:
+            1.  Case-normalise relation_type to lowercase.
+            2.  Append a link object to links with the target
+                target_uri, relation type of relation_type, context of
+                context_uri, and target attributes target_attributes.
+
+   3.  Return links.
+
+<span class="h3"><a class="selflink" name="appendix-B.3" href="#appendix-B.3">B.3</a>.  Parsing Parameters</span>
+
+   This algorithm parses the parameters from a header field value.
+   Given input, an ASCII string, it returns a list of (string
+   parameter_name, string parameter_value) tuples that it contains.
+   input is modified to remove the parsed parameters.
+
+   1.  Let parameters be an empty list.
+
+   2.  While input has content:
+       1.   Consume any leading OWS.
+       2.   If the first character is not ";", return parameters.
+       3.   Discard the leading ";" character.
+       4.   Consume any leading OWS.
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 22]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-23" id="page-23" href="#page-23" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+       5.   Consume up to but not including the first BWS, "=", ";", or
+            "," character, or up to the end of input, and let the result
+            be parameter_name.
+       6.   Consume any leading BWS.
+       7.   If the next character is "=":
+            1.  Discard the leading "=" character.
+            2.  Consume any leading BWS.
+            3.  If the next character is DQUOTE, let parameter_value be
+                the result of Parsing a Quoted String (Appendix B.4)
+                from input (consuming zero or more characters of it).
+            4.  Else, consume the contents up to but not including the
+                first ";" or "," character, or up to the end of input,
+                and let the results be parameter_value.
+            5.  If the last character of parameter_name is an asterisk
+                ("*"), decode parameter_value according to [<a href="./rfc8187" title="&quot;Indicating Character Encoding and Language for HTTP Header Field Parameters&quot;">RFC8187</a>].
+                Continue processing input if an unrecoverable error is
+                encountered.
+       8.   Else:
+            1.  Let parameter_value be an empty string.
+       9.   Case-normalise parameter_name to lowercase.
+       10.  Append (parameter_name, parameter_value) to parameters.
+       11.  Consume any leading OWS.
+       12.  If the next character is "," or the end of input, stop
+            processing input and return parameters.
+
+<span class="h3"><a class="selflink" name="appendix-B.4" href="#appendix-B.4">B.4</a>.  Parsing a Quoted String</span>
+
+   This algorithm parses a quoted string, as per <a href="./rfc7230#section-3.2.6">[RFC7230],
+   Section&nbsp;3.2.6</a>.  Given input, an ASCII string, it returns an unquoted
+   string. input is modified to remove the parsed string.
+
+   1.  Let output be an empty string.
+
+   2.  If the first character of input is not DQUOTE, return output.
+
+   3.  Discard the first character.
+
+   4.  While input has content:
+       1.  If the first character is a backslash ("\"):
+           1.  Discard the first character.
+           2.  If there is no more input, return output.
+           3.  Else, consume the first character and append it to
+               output.
+       2.  Else, if the first character is DQUOTE, discard it and return
+           output.
+       3.  Else, consume the first character and append it to output.
+
+   5.  Return output.
+
+
+
+<span class="grey">Nottingham                   Standards Track                   [Page 23]</span></pre>
+<hr class='noprint' style='width: 96ex;' align='left'/><!--NewPage--><pre class='newpage'><a name="page-24" id="page-24" href="#page-24" class="invisible"> </a>
+<span class="grey"><a href="./rfc8288">RFC 8288</a>                       Web Linking                  October 2017</span>
+
+
+<span class="h2"><a class="selflink" name="appendix-C" href="#appendix-C">Appendix C</a>.  Changes from <a href="./rfc5988">RFC 5988</a></span>
+
+   This specification has the following differences from its
+   predecessor, <a href="./rfc5988">RFC 5988</a>:
+
+   o  The initial relation type registrations were removed, since
+      they've already been registered by <a href="./rfc5988">RFC 5988</a>.
+   o  The introduction has been shortened.
+   o  The "Link Relation Application Data" registry has been removed.
+   o  Incorporated errata.
+   o  Updated references.
+   o  Link cardinality was clarified.
+   o  Terminology was changed from "target IRI" and "context IRI" to
+      "link target" and "link context", respectively.
+   o  Made assigning a URI to registered relation types serialisation
+      specific.
+   o  Removed misleading statement that the Link header field is
+      semantically equivalent to HTML and Atom links.
+   o  More carefully defined and used "link serialisations" and "link
+      applications."
+   o  Clarified the cardinality of target attributes (generically and
+      for "type").
+   o  Corrected the default link context for the Link header field, to
+      be dependent upon the identity of the representation (as per
+      <a href="./rfc7231">RFC 7231</a>).
+   o  Defined a suggested parsing algorithm for the Link header.
+   o  The value space of target attributes and their definition has been
+      specified.
+   o  The ABNF has been updated to be compatible with [<a href="./rfc7230" title="&quot;Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing&quot;">RFC7230</a>].  In
+      particular, whitespace is now explicit.
+   o  Some parameters on the HTTP header field can now appear as a
+      token.
+   o  Parameters on the HTTP header can now be valueless.
+   o  Handling of quoted strings is now defined by [<a href="./rfc7230" title="&quot;Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing&quot;">RFC7230</a>].
+   o  The "type" header field parameter now needs to be quoted (as
+      "token" does not allow "/").
+
+Author's Address
+
+   Mark Nottingham
+
+   Email: mnot@mnot.net
+   URI:   <a href="https://www.mnot.net/">https://www.mnot.net/</a>
+
+
+
+
+
+
+
+
+Nottingham                   Standards Track                   [Page 24]
+
+</pre><br />
+    <span class="noprint"><small><small>Html markup produced by rfcmarkup 1.129d, available from
+      <a href="https://tools.ietf.org/tools/rfcmarkup/">https://tools.ietf.org/tools/rfcmarkup/</a>
+    </small></small></span>
+  </div>
+</body>
+</html>

diff --git a/test/lib/rfc8288-web-linking.js b/test/lib/rfc8288-web-linking.js
new file mode 100644 (file)
index 0000000..6bdc188
--- /dev/null
+++ b/test/lib/rfc8288-web-linking.js
@@ -0,0 +1,275 @@
+/* eslint-env mocha */
+'use strict';
+
+const assert = require('assert');
+
+describe('RFC 8288 Header parser', function () {
+  const { parse, SyntaxError: PEGSyntaxError } = require('../../lib/rfc8288-web-linking');
+
+  function checkParser(linkHeader, expectedResult) {
+    const result = parse(linkHeader.replace(/\r?\n|\r/gm, ''));
+    assert.deepStrictEqual(result, expectedResult);
+  }
+
+  describe('§3.3 Relation Type', function () {
+    it('Must ignore occurrences after the first', function () {
+      const linkHeader = [
+        '<http://example.org/>;',
+        'rel="start"; rel="ignore"; foo',
+      ].join('\n');
+      const expectedResult = [
+        {
+          target: 'http://example.org/',
+          attributes: [
+            {
+              extended: false,
+              name: 'rel',
+              value: 'start',
+            },
+            {
+              extended: false,
+              name: 'foo',
+              value: null,
+            },
+          ],
+        },
+      ];
+      checkParser(linkHeader, expectedResult);
+    });
+  });
+
+  describe('§3.5 Link Header Field Examples', function () {
+    it('a', function () {
+      const linkHeader = [
+        '<http://example.com/TheBook/chapter2>; rel="previous";',
+        'title="previous chapter"',
+      ].join('\n');
+      const expectedResult = [
+        {
+          target: 'http://example.com/TheBook/chapter2',
+          attributes: [
+            {
+              extended: false,
+              name: 'rel',
+              value: 'previous',
+            },
+            {
+              extended: false,
+              name: 'title',
+              value: 'previous chapter',
+            },
+          ],
+        },
+      ];
+      checkParser(linkHeader, expectedResult);
+    });
+    it('b', function () {
+      const linkHeader = '</>; rel="http://example.net/foo"';
+      const expectedResult = [
+        {
+          target: '/',
+          attributes: [
+            {
+              extended: false,
+              name: 'rel',
+              value: 'http://example.net/foo',
+            },
+          ],
+        },
+      ];
+      checkParser(linkHeader, expectedResult);
+    });
+    it('c', function () {
+      const linkHeader = '</terms>; rel="copyright"; anchor="#foo"';
+      const expectedResult = [
+        {
+          target: '/terms',
+          attributes: [
+            {
+              extended: false,
+              name: 'rel',
+              value: 'copyright',
+            },
+            {
+              extended: false,
+              name: 'anchor',
+              value: '#foo',
+            },
+          ],
+        },
+      ];
+      checkParser(linkHeader, expectedResult);
+    });
+    it('d', function () {
+      const linkHeader = [
+        '</TheBook/chapter2>;',
+        'rel="previous"; title*=UTF-8\'de\'letztes%20Kapitel,',
+        '</TheBook/chapter4>;',
+        'rel="next"; title*=UTF-8\'de\'n%c3%a4chstes%20Kapitel',
+      ].join('\n');
+      const expectedResult = [
+        {
+          target: '/TheBook/chapter2',
+          attributes: [
+            {
+              extended: false,
+              name: 'rel',
+              value: 'previous',
+            },
+            {
+              extended: true,
+              name: 'title*',
+              value: 'UTF-8\'de\'letztes%20Kapitel',
+            },
+          ],
+        },
+        {
+          target: '/TheBook/chapter4',
+          attributes: [
+            {
+              extended: false,
+              name: 'rel',
+              value: 'next',
+            },
+            {
+              extended: true,
+              name: 'title*',
+              value: 'UTF-8\'de\'n%c3%a4chstes%20Kapitel',
+            },
+          ],
+        },
+      ];
+      checkParser(linkHeader, expectedResult);
+    });
+    it('e', function () {
+      const linkHeader = [
+        '<http://example.org/>;',
+        'rel="start http://example.net/relation/other"',
+      ].join('\n');
+      const expectedResult = [
+        {
+          target: 'http://example.org/',
+          attributes: [
+            {
+              extended: false,
+              name: 'rel',
+              value: 'start http://example.net/relation/other',
+            },
+          ],
+        },
+      ];
+      checkParser(linkHeader, expectedResult);
+    });
+    it('f', function () {
+      const linkHeader = [
+        '<https://example.org/>; rel="start",',
+        '    <https://example.org/index>; rel="index"',
+      ].join('\n');
+      const expectedResult = [
+        {
+          target: 'https://example.org/',
+          attributes: [
+            {
+              extended: false,
+              name: 'rel',
+              value: 'start',
+            },
+          ],
+        },
+        {
+          target: 'https://example.org/index',
+          attributes: [
+            {
+              extended: false,
+              name: 'rel',
+              value: 'index',
+            },
+          ],
+        },
+      ];
+      checkParser(linkHeader, expectedResult);
+    });
+  }); // §3.5 Link Header Field Examples
+
+  describe('Unusual Cases', function () {
+    it('handles uris with semicolons', function () {
+      const linkHeader = [
+        '<http://example.com/strange;url;indeed>; rel="self";',
+      ].join('\n');
+      const expectedResult = [
+        {
+          target: 'http://example.com/strange;url;indeed',
+          attributes: [
+            {
+              extended: false,
+              name: 'rel',
+              value: 'self',
+            },
+          ],
+        },
+      ];
+      checkParser(linkHeader, expectedResult);
+    });
+    it('handles value-less attributes', function () {
+      const linkHeader = [
+        '</>; special; rel="special";',
+      ].join('\n');
+      const expectedResult = [
+        {
+          target: '/',
+          attributes: [
+            {
+              extended: false,
+              name: 'special',
+              value: null,
+            },
+            {
+              extended: false,
+              name: 'rel',
+              value: 'special',
+            },
+          ],
+        },
+      ];
+      checkParser(linkHeader, expectedResult);
+    });
+  }); // Unusual Cases
+
+  describe('Extended Values', function () {
+    it('decodes extended value', function () {
+      const extendedValue = 'UTF-8\'\'%c2%a3%20and%20%e2%82%ac%20rates';
+      const expectedResult = {
+        encoding: 'UTF-8',
+        language: null,
+        value: '£ and € rates',
+      };
+      const result = parse(extendedValue, { startRule: 'extendedValue' });
+      assert.deepStrictEqual(result, expectedResult);
+    });
+  }); // Extended Values
+
+  describe('Failures', function () {
+    it('does not parse invalid header', function () {
+      const linkHeader = 'not a link header';
+      const expectedResult = [];
+      try {
+        checkParser(linkHeader, expectedResult);
+        assert.fail('unexpected success');
+      } catch (e) {
+        assert.strictEqual(e.name, 'SyntaxError');
+      }
+    });
+    it('does not parse partial invalid header', function () {
+      const linkHeader = '<https://example.com/foo>; rel="valid", not a link header';
+      const expectedResult = [];
+      try {
+        checkParser(linkHeader, expectedResult);
+        assert.fail('unexpected success');
+      } catch (e) {
+        assert(e instanceof PEGSyntaxError);
+        assert.strictEqual(e.name, 'SyntaxError');
+      }
+    });
+  }); // Failures
+
+});
\ No newline at end of file