RFC 7991, "The "xml2rfc" Version 3 Vocabulary", December 2016

Errata ID: 5887
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Rolf van Kleef
Date Reported: 2019-10-30

Section Appendix C says:

xref =
  element xref {
    attribute xml:base { text }?,
    attribute xml:lang { text }?,
    attribute target { xsd:IDREF },
    [ a:defaultValue = "false" ]
    attribute pageno { "true" | "false" }?,
    [ a:defaultValue = "default" ]
    attribute format { "default" | "title" | "counter" | "none" }?,
    attribute derivedContent { text }?,
    text
  }

It should say:

xref =
  element xref {
    attribute xml:base { text }?,
    attribute xml:lang { text }?,
    attribute target { xsd:IDREF },
    [ a:defaultValue = "false" ]
    attribute pageno { "true" | "false" }?,
    [ a:defaultValue = "default" ]
    attribute format { "default" | "title" | "counter" | "none" }?,
    attribute derivedContent { text }?,
    attribute relative { text }?,
    attribute section { text }?,
    [ a:defaultValue = "of" ]
    attribute sectionFormat { "of" | "comma" | "parens" | "bare" }?,
    text
  }

Notes:

In section 1.3.2: New Attributes for Existing Elements, the attributes 'relative', 'section', and 'sectionFormat' are added to the xref element. This is, however, not reflected in appendix C.

This same mistake is reflected in appendix D.

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