{
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    "abstract": "This document describes the RELATIONAL extension to the Sieve mail filtering language defined in RFC 3028. This extension extends existing conditional tests in Sieve to allow relational operators. In addition to testing their content, it also allows for testing of the number of entities in header and envelope fields. This document obsoletes RFC 3431. [STANDARDS-TRACK]",
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        "name": "Wolfgang Segmuller"
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      {
        "name": "Barry Leiba"
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      "confidence": "high",
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      "confidence": "high",
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      "confidence": "high",
      "note": "Constructed from provider and document identifier",
      "originalValue": null,
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      "updated": "2026-10-16T18:53:58.989Z",
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    "docNumber": "5231",
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      "confidence": "high",
      "note": "Parsed from RFC info page report metadata",
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      "confidence": "high",
      "note": "Parsed from RFC index XML title",
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      "updated": "2026-10-16T18:53:58.989Z",
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      "confidence": "high",
      "note": "Mapped from Datatracker std_level or RFC status text",
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    },
    "doi": "10.17487/RFC5231",
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      "confidence": "high",
      "note": "Parsed from RFC index XML doi",
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      "updated": "2026-10-16T18:53:58.990Z",
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    "href": "https://doi.org/10.17487/RFC5231",
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      "confidence": "high",
      "note": "Derived from DOI (https://doi.org/<doi>)",
      "originalValue": null,
      "source": "resolved",
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      "updated": "2026-10-16T18:53:58.989Z",
      "version": "extractDocs.js@commit:a6ae1efef02e"
    },
    "pages": "9",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from RFC index XML page-count",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5231/",
      "updated": "2026-10-16T18:53:58.990Z",
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    },
    "publicationDate": "2008-01-01",
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      "confidence": "high",
      "note": "Parsed from RFC index XML date",
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      "source": "parsed",
      "sourceUrl": "https://www.rfc-editor.org/info/rfc5231/",
      "updated": "2026-10-16T18:53:58.989Z",
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    "publisher": "IETF",
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      "confidence": "high",
      "note": "Static: provider",
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      "source": "parsed",
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        "confidence": "high",
        "note": "Parsed from RFC HTML normative references sections",
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      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
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        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5231/",
        "updated": "2026-10-16T18:53:58.990Z",
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        "confidence": "high",
        "note": "Derived from presence of errata links on RFC/Datatracker pages",
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        "source": "parsed",
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        "updated": "2026-10-16T18:53:58.990Z",
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      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5231/",
        "updated": "2026-10-16T18:53:58.990Z",
        "version": "extractDocs.js@commit:a6ae1efef02e"
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      "statusNote": "Proposed Standard",
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        "confidence": "high",
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        "source": "parsed",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5231/",
        "updated": "2026-10-16T18:53:58.990Z",
        "version": "extractDocs.js@commit:a6ae1efef02e"
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      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Derived from supersession relationship fields",
        "originalValue": null,
        "source": "resolved",
        "sourceUrl": "https://www.rfc-editor.org/info/rfc5231/",
        "updated": "2026-10-16T18:53:58.990Z",
        "version": "extractDocs.js@commit:a6ae1efef02e"
      },
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        "confidence": "high",
        "note": "Parsed from RFC index XML",
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        "updated": "2026-10-16T18:53:58.990Z",
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}