<?xml version=“1.0” encoding=“UTF-8”?> <grammar xmlns:a=“relaxng.org/ns/compatibility/annotations/1.0” xmlns=“relaxng.org/ns/structure/1.0” datatypeLibrary=“www.w3.org/2001/XMLSchema-datatypes”>

<define name="rfc">
  <element name="rfc">
    <optional>
      <attribute name="number"/>
    </optional>
    <optional>
      <attribute name="obsoletes" a:defaultValue=""/>
    </optional>
    <optional>
      <attribute name="updates" a:defaultValue=""/>
    </optional>
    <optional>
      <attribute name="category">
        <choice>
          <value>std</value>
          <value>bcp</value>
          <value>info</value>
          <value>exp</value>
          <value>historic</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="consensus">
        <choice>
          <value>no</value>
          <value>yes</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="seriesNo"/>
    </optional>
    <optional>
      <attribute name="ipr">
        <choice>
          <value>full2026</value>
          <value>noDerivativeWorks2026</value>
          <value>none</value>
          <value>full3667</value>
          <value>noModification3667</value>
          <value>noDerivatives3667</value>
          <value>full3978</value>
          <value>noModification3978</value>
          <value>noDerivatives3978</value>
          <value>trust200811</value>
          <value>noModificationTrust200811</value>
          <value>noDerivativesTrust200811</value>
          <value>trust200902</value>
          <value>noModificationTrust200902</value>
          <value>noDerivativesTrust200902</value>
          <value>pre5378Trust200902</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="iprExtract">
        <data type="IDREF"/>
      </attribute>
    </optional>
    <optional>
      <attribute name="submissionType" a:defaultValue="IETF">
        <choice>
          <value>IETF</value>
          <value>IAB</value>
          <value>IRTF</value>
          <value>independent</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="docName"/>
    </optional>
    <optional>
      <attribute name="xml:lang" a:defaultValue="en"/>
    </optional>
    <ref name="front"/>
    <ref name="middle"/>
    <optional>
      <ref name="back"/>
    </optional>
  </element>
</define>
<define name="front">
  <element name="front">
    <ref name="title"/>
    <oneOrMore>
      <ref name="author"/>
    </oneOrMore>
    <ref name="date"/>
    <zeroOrMore>
      <ref name="area"/>
    </zeroOrMore>
    <zeroOrMore>
      <ref name="workgroup"/>
    </zeroOrMore>
    <zeroOrMore>
      <ref name="keyword"/>
    </zeroOrMore>
    <optional>
      <ref name="abstract"/>
    </optional>
    <zeroOrMore>
      <ref name="note"/>
    </zeroOrMore>
  </element>
</define>
<define name="title">
  <element name="title">
    <optional>
      <attribute name="abbrev"/>
    </optional>
    <text/>
  </element>
</define>
<define name="author">
  <element name="author">
    <optional>
      <attribute name="initials"/>
    </optional>
    <optional>
      <attribute name="surname"/>
    </optional>
    <optional>
      <attribute name="fullname"/>
    </optional>
    <optional>
      <attribute name="role">
        <value>editor</value>
      </attribute>
    </optional>
    <optional>
      <ref name="organization"/>
    </optional>
    <optional>
      <ref name="address"/>
    </optional>
  </element>
</define>
<define name="organization">
  <element name="organization">
    <optional>
      <attribute name="abbrev"/>
    </optional>
    <text/>
  </element>
</define>
<define name="address">
  <element name="address">
    <optional>
      <ref name="postal"/>
    </optional>
    <optional>
      <ref name="phone"/>
    </optional>
    <optional>
      <ref name="facsimile"/>
    </optional>
    <optional>
      <ref name="email"/>
    </optional>
    <optional>
      <ref name="uri"/>
    </optional>
  </element>
</define>
<define name="postal">
  <element name="postal">
    <oneOrMore>
      <ref name="street"/>
    </oneOrMore>
    <zeroOrMore>
      <choice>
        <ref name="city"/>
        <ref name="region"/>
        <ref name="code"/>
        <ref name="country"/>
      </choice>
    </zeroOrMore>
  </element>
</define>
<define name="street">
  <element name="street">
    <text/>
  </element>
</define>
<define name="city">
  <element name="city">
    <text/>
  </element>
</define>
<define name="region">
  <element name="region">
    <text/>
  </element>
</define>
<define name="code">
  <element name="code">
    <text/>
  </element>
</define>
<define name="country">
  <element name="country">
    <text/>
  </element>
</define>
<define name="phone">
  <element name="phone">
    <text/>
  </element>
</define>
<define name="facsimile">
  <element name="facsimile">
    <text/>
  </element>
</define>
<define name="email">
  <element name="email">
    <text/>
  </element>
</define>
<define name="uri">
  <element name="uri">
    <text/>
  </element>
</define>
<define name="date">
  <element name="date">
    <optional>
      <attribute name="day"/>
    </optional>
    <optional>
      <attribute name="month"/>
    </optional>
    <optional>
      <attribute name="year"/>
    </optional>
    <empty/>
  </element>
</define>
<define name="area">
  <element name="area">
    <text/>
  </element>
</define>
<define name="workgroup">
  <element name="workgroup">
    <text/>
  </element>
</define>
<define name="keyword">
  <element name="keyword">
    <text/>
  </element>
</define>
<define name="abstract">
  <element name="abstract">
    <oneOrMore>
      <ref name="t"/>
    </oneOrMore>
  </element>
</define>
<define name="note">
  <element name="note">
    <attribute name="title"/>
    <oneOrMore>
      <ref name="t"/>
    </oneOrMore>
  </element>
</define>
<define name="middle">
  <element name="middle">
    <oneOrMore>
      <ref name="section"/>
    </oneOrMore>
  </element>
</define>
<define name="section">
  <element name="section">
    <optional>
      <attribute name="anchor">
        <data type="ID"/>
      </attribute>
    </optional>
    <attribute name="title"/>
    <optional>
      <attribute name="toc" a:defaultValue="default">
        <choice>
          <value>include</value>
          <value>exclude</value>
          <value>default</value>
        </choice>
      </attribute>
    </optional>
    <zeroOrMore>
      <choice>
        <ref name="t"/>
        <ref name="figure"/>
        <ref name="texttable"/>
        <ref name="iref"/>
      </choice>
    </zeroOrMore>
    <zeroOrMore>
      <ref name="section"/>
    </zeroOrMore>
  </element>
</define>
<define name="t">
  <element name="t">
    <optional>
      <attribute name="anchor">
        <data type="ID"/>
      </attribute>
    </optional>
    <optional>
      <attribute name="hangText"/>
    </optional>
    <zeroOrMore>
      <choice>
        <text/>
        <ref name="list"/>
        <ref name="figure"/>
        <ref name="xref"/>
        <ref name="eref"/>
        <ref name="iref"/>
        <ref name="cref"/>
        <ref name="spanx"/>
        <ref name="vspace"/>
      </choice>
    </zeroOrMore>
  </element>
</define>
<define name="list">
  <element name="list">
    <optional>
      <attribute name="style"/>
    </optional>
    <optional>
      <attribute name="hangIndent"/>
    </optional>
    <optional>
      <attribute name="counter"/>
    </optional>
    <oneOrMore>
      <ref name="t"/>
    </oneOrMore>
  </element>
</define>
<define name="xref">
  <element name="xref">
    <attribute name="target">
      <data type="IDREF"/>
    </attribute>
    <optional>
      <attribute name="pageno" a:defaultValue="false">
        <choice>
          <value>true</value>
          <value>false</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="format" a:defaultValue="default">
        <choice>
          <value>counter</value>
          <value>title</value>
          <value>none</value>
          <value>default</value>
        </choice>
      </attribute>
    </optional>
    <text/>
  </element>
</define>
<define name="eref">
  <element name="eref">
    <attribute name="target"/>
    <text/>
  </element>
</define>
<define name="iref">
  <element name="iref">
    <attribute name="item"/>
    <optional>
      <attribute name="subitem" a:defaultValue=""/>
    </optional>
    <optional>
      <attribute name="primary" a:defaultValue="false">
        <choice>
          <value>true</value>
          <value>false</value>
        </choice>
      </attribute>
    </optional>
    <empty/>
  </element>
</define>
<define name="cref">
  <element name="cref">
    <optional>
      <attribute name="anchor">
        <data type="ID"/>
      </attribute>
    </optional>
    <optional>
      <attribute name="source"/>
    </optional>
    <text/>
  </element>
</define>
<define name="spanx">
  <element name="spanx">
    <optional>
      <attribute name="xml:space" a:defaultValue="preserve">
        <choice>
          <value>default</value>
          <value>preserve</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="style" a:defaultValue="emph"/>
    </optional>
    <text/>
  </element>
</define>
<define name="vspace">
  <element name="vspace">
    <optional>
      <attribute name="blankLines" a:defaultValue="0"/>
    </optional>
    <empty/>
  </element>
</define>
<define name="figure">
  <element name="figure">
    <optional>
      <attribute name="anchor">
        <data type="ID"/>
      </attribute>
    </optional>
    <optional>
      <attribute name="title" a:defaultValue=""/>
    </optional>
    <optional>
      <attribute name="suppress-title" a:defaultValue="false">
        <choice>
          <value>true</value>
          <value>false</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="src"/>
    </optional>
    <optional>
      <attribute name="align" a:defaultValue="left">
        <choice>
          <value>left</value>
          <value>center</value>
          <value>right</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="alt" a:defaultValue=""/>
    </optional>
    <optional>
      <attribute name="width" a:defaultValue=""/>
    </optional>
    <optional>
      <attribute name="height" a:defaultValue=""/>
    </optional>
    <zeroOrMore>
      <ref name="iref"/>
    </zeroOrMore>
    <optional>
      <ref name="preamble"/>
    </optional>
    <ref name="artwork"/>
    <optional>
      <ref name="postamble"/>
    </optional>
  </element>
</define>
<define name="preamble">
  <element name="preamble">
    <zeroOrMore>
      <choice>
        <text/>
        <ref name="xref"/>
        <ref name="eref"/>
        <ref name="iref"/>
        <ref name="cref"/>
        <ref name="spanx"/>
      </choice>
    </zeroOrMore>
  </element>
</define>
<define name="artwork">
  <element name="artwork">
    <optional>
      <attribute name="xml:space" a:defaultValue="preserve">
        <choice>
          <value>default</value>
          <value>preserve</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="name" a:defaultValue=""/>
    </optional>
    <optional>
      <attribute name="type" a:defaultValue=""/>
    </optional>
    <optional>
      <attribute name="src"/>
    </optional>
    <optional>
      <attribute name="align" a:defaultValue="left">
        <choice>
          <value>left</value>
          <value>center</value>
          <value>right</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="alt" a:defaultValue=""/>
    </optional>
    <optional>
      <attribute name="width" a:defaultValue=""/>
    </optional>
    <optional>
      <attribute name="height" a:defaultValue=""/>
    </optional>
    <zeroOrMore>
      <text/>
    </zeroOrMore>
  </element>
</define>
<define name="postamble">
  <element name="postamble">
    <zeroOrMore>
      <choice>
        <text/>
        <ref name="xref"/>
        <ref name="eref"/>
        <ref name="iref"/>
        <ref name="cref"/>
        <ref name="spanx"/>
      </choice>
    </zeroOrMore>
  </element>
</define>
<define name="texttable">
  <element name="texttable">
    <optional>
      <attribute name="anchor">
        <data type="ID"/>
      </attribute>
    </optional>
    <optional>
      <attribute name="title" a:defaultValue=""/>
    </optional>
    <optional>
      <attribute name="suppress-title" a:defaultValue="false">
        <choice>
          <value>true</value>
          <value>false</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="align" a:defaultValue="center">
        <choice>
          <value>left</value>
          <value>center</value>
          <value>right</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <attribute name="style" a:defaultValue="full">
        <choice>
          <value>all</value>
          <value>none</value>
          <value>headers</value>
          <value>full</value>
        </choice>
      </attribute>
    </optional>
    <optional>
      <ref name="preamble"/>
    </optional>
    <oneOrMore>
      <ref name="ttcol"/>
    </oneOrMore>
    <zeroOrMore>
      <ref name="c"/>
    </zeroOrMore>
    <optional>
      <ref name="postamble"/>
    </optional>
  </element>
</define>
<define name="ttcol">
  <element name="ttcol">
    <optional>
      <attribute name="width"/>
    </optional>
    <optional>
      <attribute name="align" a:defaultValue="left">
        <choice>
          <value>left</value>
          <value>center</value>
          <value>right</value>
        </choice>
      </attribute>
    </optional>
    <text/>
  </element>
</define>
<define name="c">
  <element name="c">
    <zeroOrMore>
      <choice>
        <text/>
        <ref name="xref"/>
        <ref name="eref"/>
        <ref name="iref"/>
        <ref name="cref"/>
        <ref name="spanx"/>
      </choice>
    </zeroOrMore>
  </element>
</define>
<define name="back">
  <element name="back">
    <zeroOrMore>
      <ref name="references"/>
    </zeroOrMore>
    <zeroOrMore>
      <ref name="section"/>
    </zeroOrMore>
  </element>
</define>
<define name="references">
  <element name="references">
    <optional>
      <attribute name="title" a:defaultValue="References"/>
    </optional>
    <oneOrMore>
      <ref name="reference"/>
    </oneOrMore>
  </element>
</define>
<define name="reference">
  <element name="reference">
    <attribute name="anchor">
      <data type="ID"/>
    </attribute>
    <optional>
      <attribute name="target"/>
    </optional>
    <ref name="front"/>
    <zeroOrMore>
      <ref name="seriesInfo"/>
    </zeroOrMore>
    <zeroOrMore>
      <ref name="format"/>
    </zeroOrMore>
    <zeroOrMore>
      <ref name="annotation"/>
    </zeroOrMore>
  </element>
</define>
<define name="seriesInfo">
  <element name="seriesInfo">
    <attribute name="name"/>
    <attribute name="value"/>
    <empty/>
  </element>
</define>
<define name="format">
  <element name="format">
    <optional>
      <attribute name="target"/>
    </optional>
    <attribute name="type"/>
    <optional>
      <attribute name="octets"/>
    </optional>
    <empty/>
  </element>
</define>
<define name="annotation">
  <element name="annotation">
    <zeroOrMore>
      <choice>
        <text/>
        <ref name="xref"/>
        <ref name="eref"/>
        <ref name="iref"/>
        <ref name="cref"/>
        <ref name="spanx"/>
      </choice>
    </zeroOrMore>
  </element>
</define>
<start>
  <ref name="rfc"/>
</start>

</grammar>