{
  "$schema": "/api/schemas/documents.schema.json",
  "apiVersion": "1.1.0",
  "lastModified": "2026-10-12T20:45:36.177Z",
  "sourcePath": "src/main/data/docs",
  "docId": "RFC2671",
  "document": {
    "abstract": "The Domain Name System's wire protocol includes a number of fixed fields whose range has been or soon will be exhausted and does not allow clients to advertise their capabilities to servers. This document describes backward compatible mechanisms for allowing the protocol to grow. [STANDARDS-TRACK]",
    "abstract$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML abstract",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "authors": [
      {
        "name": "Paul A. Vixie"
      }
    ],
    "authors$meta": {
      "confidence": "high",
      "note": "Parsed from Datatracker doc page article:author (profile full names)",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "docId": "RFC2671",
    "docId$meta": {
      "confidence": "high",
      "note": "Derived from RFC number or Datatracker identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "docLabel": "IETF RFC 2671",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "docNumber": "2671",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "docTitle": "Extension Mechanisms for DNS (EDNS0)",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML title",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "docType": "Standard",
    "docType$meta": {
      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "doi": "10.17487/RFC2671",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "href": "https://doi.org/10.17487/RFC2671",
    "href$meta": {
      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "keywords": [
      "EDNS0",
      "DNS",
      "Resource Records"
    ],
    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML keywords",
      "originalValue": [
        "EDNS0",
        "DNS",
        "Resource Records",
        "Opt"
      ],
      "overridden": true,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:45:36.177Z",
      "version": "extractDocs.js@commit:158b95d12c23"
    },
    "pages": "7",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "publicationDate": "1999-08-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML date",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "publisher": "IETF",
    "publisher$meta": {
      "confidence": "high",
      "note": "Static: provider",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "references": {
      "bibliographic": [
        "RFC1035"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "flag": "MIXED_REF_LAYOUT_RISK anchored=1 proseBlocks=2 skippedAnchorBlocks=1",
        "note": "Parsed from RFC HTML references/informative sections",
        "originalValue": [],
        "reviewRequired": true,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
        "updated": "2026-10-12T20:10:57.060Z",
        "version": "extractDocs.js@commit:00855ca34fe0"
      }
    },
    "resolvedHref": "https://www.rfc-editor.org/info/rfc2671/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
      "updated": "2026-10-12T20:10:57.060Z",
      "version": "extractDocs.js@commit:00855ca34fe0"
    },
    "status": {
      "active": false,
      "active$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
        "updated": "2026-10-12T20:10:57.060Z",
        "version": "extractDocs.js@commit:00855ca34fe0"
      },
      "errataExist": false,
      "errataExist$meta": {
        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
        "updated": "2026-10-12T20:10:57.060Z",
        "version": "extractDocs.js@commit:00855ca34fe0"
      },
      "latestVersion": false,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
        "updated": "2026-10-12T20:10:57.060Z",
        "version": "extractDocs.js@commit:00855ca34fe0"
      },
      "statusNote": "Proposed Standard",
      "statusNote$meta": {
        "confidence": "high",
        "note": "Mapped from Datatracker doc.json std_level",
        "originalValue": null,
        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
        "updated": "2026-10-12T20:10:57.060Z",
        "version": "extractDocs.js@commit:00855ca34fe0"
      },
      "superseded": true,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
        "updated": "2026-10-12T20:10:57.060Z",
        "version": "extractDocs.js@commit:00855ca34fe0"
      },
      "supersededBy": [
        "RFC6891"
      ],
      "supersededBy$meta": {
        "confidence": "high",
        "note": "Parsed from RFC index XML",
        "originalValue": [],
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc2671/",
        "updated": "2026-10-12T20:10:57.060Z",
        "version": "extractDocs.js@commit:00855ca34fe0"
      }
    }
  }
}