~ubuntu-branches/ubuntu/quantal/nova/quantal-proposed

<?xml version="1.0" encoding="UTF-8"?>

<!--

  -*- rnc -*-

  RELAX NG Compact Syntax Grammar for the

  Atom Format Specification Version 11

-->

<grammar xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:s="http://www.ascc.net/xml/schematron" xmlns="http://relaxng.org/ns/structure/1.0" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">

  <start>

    <choice>

      <ref name="atomLink"/>

    </choice>

  </start>

  <!-- Common attributes -->

  <define name="atomCommonAttributes">

    <optional>

      <attribute name="xml:base">

        <ref name="atomUri"/>

      </attribute>

    </optional>

    <optional>

      <attribute name="xml:lang">

        <ref name="atomLanguageTag"/>

      </attribute>

    </optional>

    <zeroOrMore>

      <ref name="undefinedAttribute"/>

    </zeroOrMore>

  </define>

  <!-- atom:link -->

  <define name="atomLink">

    <element name="atom:link">

      <ref name="atomCommonAttributes"/>

      <attribute name="href">

        <ref name="atomUri"/>

      </attribute>

      <optional>

        <attribute name="rel">

          <choice>

            <ref name="atomNCName"/>

            <ref name="atomUri"/>

          </choice>

        </attribute>

      </optional>

      <optional>

        <attribute name="type">

          <ref name="atomMediaType"/>

        </attribute>

      </optional>

      <optional>

        <attribute name="hreflang">

          <ref name="atomLanguageTag"/>

        </attribute>

      </optional>

      <optional>

        <attribute name="title"/>

      </optional>

      <optional>

        <attribute name="length"/>

      </optional>

      <ref name="undefinedContent"/>

    </element>

  </define>

  <!-- Low-level simple types -->

  <define name="atomNCName">

    <data type="string">

      <param name="minLength">1</param>

      <param name="pattern">[^:]*</param>

    </data>

  </define>

  <!-- Whatever a media type is, it contains at least one slash -->

  <define name="atomMediaType">

    <data type="string">

      <param name="pattern">.+/.+</param>

    </data>

  </define>

  <!-- As defined in RFC 3066 -->

  <define name="atomLanguageTag">

    <data type="string">

      <param name="pattern">[A-Za-z]{1,8}(-[A-Za-z0-9]{1,8})*</param>

    </data>

  </define>

  <!--

    Unconstrained; it's not entirely clear how IRI fit into

    xsd:anyURI so let's not try to constrain it here

  -->

  <define name="atomUri">

    <text/>

  </define>

  <!-- Other Extensibility -->

  <define name="undefinedAttribute">

    <attribute>

      <anyName>

        <except>

          <name>xml:base</name>

          <name>xml:lang</name>

          <nsName ns=""/>

        </except>

      </anyName>

    </attribute>

  </define>

  <define name="undefinedContent">

    <zeroOrMore>

      <choice>

        <text/>

        <ref name="anyForeignElement"/>

      </choice>

    </zeroOrMore>

  </define>

  <define name="anyElement">

    <element>

      <anyName/>

      <zeroOrMore>

        <choice>

          <attribute>

            <anyName/>

          </attribute>

          <text/>

          <ref name="anyElement"/>

        </choice>

      </zeroOrMore>

    </element>

  </define>

  <define name="anyForeignElement">

    <element>

      <anyName>

        <except>

          <nsName ns="http://www.w3.org/2005/Atom"/>

        </except>

      </anyName>

      <zeroOrMore>

        <choice>

          <attribute>

            <anyName/>

          </attribute>

          <text/>

          <ref name="anyElement"/>

        </choice>

      </zeroOrMore>

    </element>

  </define>

</grammar>