<?xml version="1.0" encoding="UTF-8"?>
<grammar ns="https://www.metanorma.org/ns/itu" xmlns="http://relaxng.org/ns/structure/1.0" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
  <!--
    Currently we inherit from a namespaced grammar, isostandard. Until we inherit from isodoc,
    we cannot have a new default namespace: we will end up with a grammar with two different
    namespaces, one for isostandard and one for csand additions. And we do not want that.
  -->
  <include href="isodoc.rng">
    <start>
      <ref name="itu"/>
    </start>
    <define name="ol">
      <element name="ol">
        <attribute name="id">
          <data type="ID"/>
        </attribute>
        <optional>
          <attribute name="class">
            <value>steps</value>
          </attribute>
        </optional>
        <oneOrMore>
          <ref name="li"/>
        </oneOrMore>
        <zeroOrMore>
          <ref name="note"/>
        </zeroOrMore>
      </element>
    </define>
    <define name="DocumentType">
      <choice>
        <value>recommendation</value>
        <value>recommendation-supplement</value>
        <value>recommendation-amendment</value>
        <value>recommendation-corrigendum</value>
        <value>recommendation-errata</value>
        <value>recommendation-annex</value>
        <value>focus-group</value>
        <value>implementers-guide</value>
        <value>technical-paper</value>
        <value>technical-report</value>
        <value>joint-itu-iso-iec</value>
        <value>resolution</value>
      </choice>
    </define>
    <define name="editorialgroup">
      <element name="editorialgroup">
        <ref name="bureau"/>
        <optional>
          <ref name="group"/>
        </optional>
        <optional>
          <ref name="subgroup"/>
        </optional>
        <optional>
          <ref name="workgroup"/>
        </optional>
      </element>
    </define>
    <define name="structuredidentifier">
      <element name="structuredidentifier">
        <ref name="bureau"/>
        <element name="docnumber">
          <text/>
        </element>
        <optional>
          <element name="annexid">
            <text/>
          </element>
        </optional>
        <optional>
          <element name="amendment">
            <data type="int"/>
          </element>
        </optional>
        <optional>
          <element name="corrigendum">
            <data type="int"/>
          </element>
        </optional>
      </element>
    </define>
    <define name="BibDataExtensionType">
      <optional>
        <ref name="doctype"/>
      </optional>
      <ref name="editorialgroup"/>
      <zeroOrMore>
        <ref name="ics"/>
      </zeroOrMore>
      <optional>
        <ref name="recommendationstatus"/>
      </optional>
      <optional>
        <ref name="ipnoticereceived"/>
      </optional>
      <optional>
        <ref name="meeting"/>
      </optional>
      <optional>
        <ref name="meeting-date"/>
      </optional>
      <optional>
        <ref name="intended-type"/>
      </optional>
      <optional>
        <ref name="ext_source"/>
      </optional>
      <optional>
        <ref name="structuredidentifier"/>
      </optional>
    </define>
    <define name="preface">
      <element name="preface">
        <oneOrMore>
          <choice>
            <ref name="content"/>
            <ref name="abstract"/>
            <ref name="foreword"/>
            <ref name="introduction"/>
            <ref name="acknowledgements"/>
            <ref name="clause"/>
          </choice>
        </oneOrMore>
      </element>
    </define>
  </include>
  <define name="meeting">
    <element name="meeting">
      <text/>
    </element>
  </define>
  <define name="meeting-date">
    <element name="meeting-date">
      <choice>
        <group>
          <element name="from">
            <ref name="ISO8601Date"/>
          </element>
          <optional>
            <element name="to">
              <ref name="ISO8601Date"/>
            </element>
          </optional>
        </group>
        <element name="on">
          <ref name="ISO8601Date"/>
        </element>
      </choice>
    </element>
  </define>
  <define name="intended-type">
    <element name="intended-type">
      <choice>
        <value>R</value>
        <value>C</value>
        <value>TD</value>
      </choice>
    </element>
  </define>
  <define name="ext_source">
    <element name="source">
      <text/>
    </element>
  </define>
  <define name="TextElement" combine="choice">
    <choice>
      <ref name="add"/>
      <ref name="del"/>
    </choice>
  </define>
  <define name="add">
    <element name="add">
      <choice>
        <ref name="PureTextElement"/>
        <ref name="eref"/>
        <ref name="stem"/>
        <ref name="keyword"/>
        <ref name="xref"/>
        <ref name="hyperlink"/>
      </choice>
    </element>
  </define>
  <define name="del">
    <element name="del">
      <choice>
        <ref name="PureTextElement"/>
        <ref name="eref"/>
        <ref name="stem"/>
        <ref name="keyword"/>
        <ref name="xref"/>
        <ref name="hyperlink"/>
      </choice>
    </element>
  </define>
  <define name="ipnoticereceived">
    <element name="ip-notice-received">
      <data type="boolean"/>
    </element>
  </define>
  <define name="recommendationstatus">
    <element name="recommendationstatus">
      <element name="from">
        <ref name="ISO8601Date"/>
      </element>
      <element name="to">
        <ref name="ISO8601Date"/>
      </element>
      <optional>
        <ref name="approvalstage"/>
      </optional>
    </element>
  </define>
  <define name="approvalstage">
    <element name="approvalstage">
      <attribute name="process">
        <choice>
          <value>tap</value>
          <value>aap</value>
        </choice>
      </attribute>
      <choice>
        <value>determined</value>
        <value>in-force</value>
        <value>a</value>
        <value>lc</value>
        <value>ac</value>
        <value>lj</value>
        <value>aj</value>
        <value>na</value>
        <value>ar</value>
        <value>ri</value>
        <value>at</value>
        <value>sg</value>
        <value>c</value>
        <value>tap</value>
      </choice>
    </element>
  </define>
  <define name="bureau">
    <element name="bureau">
      <choice>
        <value>T</value>
        <value>D</value>
        <value>R</value>
      </choice>
    </element>
  </define>
  <define name="group">
    <element name="group">
      <ref name="ItuGroup"/>
    </element>
  </define>
  <define name="subgroup">
    <element name="subgroup">
      <ref name="ItuGroup"/>
    </element>
  </define>
  <define name="ItuGroup">
    <optional>
      <attribute name="type">
        <choice>
          <value>tsag</value>
          <value>study-group</value>
          <value>work-group</value>
        </choice>
      </attribute>
    </optional>
    <ref name="tname"/>
    <optional>
      <ref name="groupacronym"/>
    </optional>
    <optional>
      <ref name="groupperiod"/>
    </optional>
  </define>
  <define name="groupacronym">
    <element name="acronym">
      <text/>
    </element>
  </define>
  <define name="groupperiod">
    <element name="period">
      <ref name="groupperiodstart"/>
      <optional>
        <ref name="groupperiodend"/>
      </optional>
    </element>
  </define>
  <define name="groupperiodstart">
    <element name="start">
      <data type="gYear"/>
    </element>
  </define>
  <define name="groupperiodend">
    <element name="end">
      <data type="gYear"/>
    </element>
  </define>
  <define name="workgroup">
    <element name="workgroup">
      <ref name="ItuGroup"/>
    </element>
  </define>
  <define name="itu">
    <element name="itu-standard">
      <attribute name="version"/>
      <attribute name="type">
        <choice>
          <value>semantic</value>
          <value>presentation</value>
        </choice>
      </attribute>
      <ref name="bibdata"/>
      <zeroOrMore>
        <ref name="termdocsource"/>
      </zeroOrMore>
      <optional>
        <ref name="boilerplate"/>
      </optional>
      <ref name="preface"/>
      <oneOrMore>
        <ref name="sections"/>
      </oneOrMore>
      <zeroOrMore>
        <ref name="annex"/>
      </zeroOrMore>
      <ref name="bibliography"/>
    </element>
  </define>
</grammar>