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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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  -*- rnc -*-
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  RELAX NG Compact Syntax Grammar for the
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  Atom Format Specification Version 11
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-->
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<grammar ns="http://www.w3.org/1999/xhtml" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:s="http://www.ascc.net/xml/schematron" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns="http://relaxng.org/ns/structure/1.0" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
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  <start>
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    <choice>
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      <ref name="atomFeed"/>
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      <ref name="atomEntry"/>
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    </choice>
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  </start>
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  <!-- Common attributes -->
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  <define name="atomCommonAttributes">
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    <optional>
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      <attribute name="xml:base">
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        <ref name="atomUri"/>
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      </attribute>
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    </optional>
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    <optional>
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      <attribute name="xml:lang">
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        <ref name="atomLanguageTag"/>
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      </attribute>
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    </optional>
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    <zeroOrMore>
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      <ref name="undefinedAttribute"/>
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    </zeroOrMore>
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  </define>
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  <!-- Text Constructs -->
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  <define name="atomPlainTextConstruct">
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    <ref name="atomCommonAttributes"/>
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    <optional>
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      <attribute name="type">
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        <choice>
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          <value>text</value>
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          <value>html</value>
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        </choice>
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      </attribute>
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    </optional>
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    <text/>
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  </define>
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  <define name="atomXHTMLTextConstruct">
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    <ref name="atomCommonAttributes"/>
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    <attribute name="type">
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      <value>xhtml</value>
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    </attribute>
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    <ref name="xhtmlDiv"/>
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  </define>
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  <define name="atomTextConstruct">
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    <choice>
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      <ref name="atomPlainTextConstruct"/>
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      <ref name="atomXHTMLTextConstruct"/>
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    </choice>
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  </define>
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  <!-- Person Construct -->
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  <define name="atomPersonConstruct">
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    <ref name="atomCommonAttributes"/>
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    <interleave>
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      <element name="atom:name">
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        <text/>
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      </element>
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      <optional>
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        <element name="atom:uri">
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          <ref name="atomUri"/>
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        </element>
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      </optional>
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      <optional>
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        <element name="atom:email">
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          <ref name="atomEmailAddress"/>
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        </element>
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      </optional>
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      <zeroOrMore>
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        <ref name="extensionElement"/>
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      </zeroOrMore>
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    </interleave>
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  </define>
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  <!-- Date Construct -->
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  <define name="atomDateConstruct">
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    <ref name="atomCommonAttributes"/>
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    <data type="dateTime"/>
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  </define>
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  <!-- atom:feed -->
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  <define name="atomFeed">
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    <element name="atom:feed">
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      <s:rule context="atom:feed">
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        <s:assert test="atom:author or not(atom:entry[not(atom:author)])">An atom:feed must have an atom:author unless all of its atom:entry children have an atom:author.</s:assert>
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      </s:rule>
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      <ref name="atomCommonAttributes"/>
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      <interleave>
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        <zeroOrMore>
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          <ref name="atomAuthor"/>
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        </zeroOrMore>
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        <zeroOrMore>
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          <ref name="atomCategory"/>
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        </zeroOrMore>
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        <zeroOrMore>
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          <ref name="atomContributor"/>
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        </zeroOrMore>
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        <optional>
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          <ref name="atomGenerator"/>
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        </optional>
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        <optional>
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          <ref name="atomIcon"/>
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        </optional>
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        <ref name="atomId"/>
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        <zeroOrMore>
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          <ref name="atomLink"/>
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        </zeroOrMore>
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        <optional>
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          <ref name="atomLogo"/>
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        </optional>
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        <optional>
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          <ref name="atomRights"/>
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        </optional>
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        <optional>
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          <ref name="atomSubtitle"/>
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        </optional>
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        <ref name="atomTitle"/>
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        <ref name="atomUpdated"/>
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        <zeroOrMore>
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          <ref name="extensionElement"/>
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        </zeroOrMore>
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      </interleave>
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      <zeroOrMore>
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        <ref name="atomEntry"/>
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      </zeroOrMore>
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    </element>
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  </define>
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  <!-- atom:entry -->
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  <define name="atomEntry">
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    <element name="atom:entry">
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      <s:rule context="atom:entry">
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        <s:assert test="atom:link[@rel='alternate'] or atom:link[not(@rel)] or atom:content">An atom:entry must have at least one atom:link element with a rel attribute of 'alternate' or an atom:content.</s:assert>
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      </s:rule>
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      <s:rule context="atom:entry">
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        <s:assert test="atom:author or ../atom:author or atom:source/atom:author">An atom:entry must have an atom:author if its feed does not.</s:assert>
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      </s:rule>
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      <ref name="atomCommonAttributes"/>
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      <interleave>
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        <zeroOrMore>
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          <ref name="atomAuthor"/>
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        </zeroOrMore>
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        <zeroOrMore>
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          <ref name="atomCategory"/>
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        </zeroOrMore>
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        <optional>
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          <ref name="atomContent"/>
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        </optional>
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        <zeroOrMore>
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          <ref name="atomContributor"/>
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        </zeroOrMore>
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        <ref name="atomId"/>
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        <zeroOrMore>
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          <ref name="atomLink"/>
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        </zeroOrMore>
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        <optional>
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          <ref name="atomPublished"/>
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        </optional>
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        <optional>
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          <ref name="atomRights"/>
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        </optional>
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        <optional>
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          <ref name="atomSource"/>
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        </optional>
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        <optional>
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          <ref name="atomSummary"/>
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        </optional>
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        <ref name="atomTitle"/>
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        <ref name="atomUpdated"/>
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        <zeroOrMore>
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          <ref name="extensionElement"/>
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        </zeroOrMore>
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      </interleave>
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    </element>
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  </define>
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  <!-- atom:content -->
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  <define name="atomInlineTextContent">
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    <element name="atom:content">
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      <ref name="atomCommonAttributes"/>
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      <optional>
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        <attribute name="type">
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          <choice>
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            <value>text</value>
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            <value>html</value>
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          </choice>
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        </attribute>
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      </optional>
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      <zeroOrMore>
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        <text/>
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      </zeroOrMore>
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    </element>
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  </define>
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  <define name="atomInlineXHTMLContent">
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    <element name="atom:content">
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      <ref name="atomCommonAttributes"/>
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      <attribute name="type">
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        <value>xhtml</value>
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      </attribute>
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      <ref name="xhtmlDiv"/>
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    </element>
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  </define>
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  <define name="atomInlineOtherContent">
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    <element name="atom:content">
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      <ref name="atomCommonAttributes"/>
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      <optional>
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        <attribute name="type">
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          <ref name="atomMediaType"/>
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        </attribute>
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      </optional>
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      <zeroOrMore>
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        <choice>
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          <text/>
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          <ref name="anyElement"/>
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        </choice>
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      </zeroOrMore>
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    </element>
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  </define>
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  <define name="atomOutOfLineContent">
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    <element name="atom:content">
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      <ref name="atomCommonAttributes"/>
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      <optional>
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        <attribute name="type">
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          <ref name="atomMediaType"/>
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        </attribute>
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      </optional>
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      <attribute name="src">
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        <ref name="atomUri"/>
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      </attribute>
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      <empty/>
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    </element>
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  </define>
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  <define name="atomContent">
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    <choice>
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      <ref name="atomInlineTextContent"/>
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      <ref name="atomInlineXHTMLContent"/>
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      <ref name="atomInlineOtherContent"/>
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      <ref name="atomOutOfLineContent"/>
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    </choice>
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  </define>
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  <!-- atom:author -->
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  <define name="atomAuthor">
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    <element name="atom:author">
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      <ref name="atomPersonConstruct"/>
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    </element>
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  </define>
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  <!-- atom:category -->
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  <define name="atomCategory">
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    <element name="atom:category">
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      <ref name="atomCommonAttributes"/>
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      <attribute name="term"/>
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      <optional>
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        <attribute name="scheme">
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          <ref name="atomUri"/>
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        </attribute>
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      </optional>
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      <optional>
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        <attribute name="label"/>
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      </optional>
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      <ref name="undefinedContent"/>
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    </element>
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  </define>
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  <!-- atom:contributor -->
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  <define name="atomContributor">
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    <element name="atom:contributor">
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      <ref name="atomPersonConstruct"/>
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    </element>
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  </define>
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  <!-- atom:generator -->
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  <define name="atomGenerator">
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    <element name="atom:generator">
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      <ref name="atomCommonAttributes"/>
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      <optional>
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        <attribute name="uri">
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          <ref name="atomUri"/>
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        </attribute>
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      </optional>
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      <optional>
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        <attribute name="version"/>
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      </optional>
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      <text/>
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    </element>
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  </define>
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  <!-- atom:icon -->
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  <define name="atomIcon">
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    <element name="atom:icon">
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      <ref name="atomCommonAttributes"/>
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      <ref name="atomUri"/>
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    </element>
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  </define>
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  <!-- atom:id -->
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  <define name="atomId">
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    <element name="atom:id">
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      <ref name="atomCommonAttributes"/>
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      <ref name="atomUri"/>
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    </element>
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  </define>
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  <!-- atom:logo -->
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  <define name="atomLogo">
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    <element name="atom:logo">
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      <ref name="atomCommonAttributes"/>
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      <ref name="atomUri"/>
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    </element>
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  </define>
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  <!-- atom:link -->
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  <define name="atomLink">
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    <element name="atom:link">
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      <ref name="atomCommonAttributes"/>
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      <attribute name="href">
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        <ref name="atomUri"/>
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      </attribute>
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      <optional>
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        <attribute name="rel">
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          <choice>
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            <ref name="atomNCName"/>
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            <ref name="atomUri"/>
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          </choice>
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        </attribute>
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      </optional>
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      <optional>
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        <attribute name="type">
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          <ref name="atomMediaType"/>
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        </attribute>
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      </optional>
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      <optional>
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        <attribute name="hreflang">
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          <ref name="atomLanguageTag"/>
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        </attribute>
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      </optional>
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      <optional>
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        <attribute name="title"/>
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      </optional>
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      <optional>
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        <attribute name="length"/>
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      </optional>
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      <ref name="undefinedContent"/>
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    </element>
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  </define>
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  <!-- atom:published -->
340 
  <define name="atomPublished">
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    <element name="atom:published">
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      <ref name="atomDateConstruct"/>
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    </element>
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  </define>
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  <!-- atom:rights -->
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  <define name="atomRights">
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    <element name="atom:rights">
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      <ref name="atomTextConstruct"/>
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    </element>
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  </define>
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  <!-- atom:source -->
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  <define name="atomSource">
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    <element name="atom:source">
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      <ref name="atomCommonAttributes"/>
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      <interleave>
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        <zeroOrMore>
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          <ref name="atomAuthor"/>
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        </zeroOrMore>
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        <zeroOrMore>
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          <ref name="atomCategory"/>
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        </zeroOrMore>
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        <zeroOrMore>
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          <ref name="atomContributor"/>
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        </zeroOrMore>
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        <optional>
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          <ref name="atomGenerator"/>
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        </optional>
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        <optional>
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          <ref name="atomIcon"/>
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        </optional>
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        <optional>
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          <ref name="atomId"/>
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        </optional>
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        <zeroOrMore>
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          <ref name="atomLink"/>
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        </zeroOrMore>
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        <optional>
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          <ref name="atomLogo"/>
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        </optional>
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        <optional>
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          <ref name="atomRights"/>
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        </optional>
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        <optional>
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          <ref name="atomSubtitle"/>
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        </optional>
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        <optional>
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          <ref name="atomTitle"/>
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        </optional>
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        <optional>
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          <ref name="atomUpdated"/>
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        </optional>
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        <zeroOrMore>
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          <ref name="extensionElement"/>
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        </zeroOrMore>
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      </interleave>
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    </element>
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  </define>
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  <!-- atom:subtitle -->
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  <define name="atomSubtitle">
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    <element name="atom:subtitle">
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      <ref name="atomTextConstruct"/>
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    </element>
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  </define>
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  <!-- atom:summary -->
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  <define name="atomSummary">
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    <element name="atom:summary">
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      <ref name="atomTextConstruct"/>
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    </element>
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  </define>
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  <!-- atom:title -->
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  <define name="atomTitle">
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    <element name="atom:title">
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      <ref name="atomTextConstruct"/>
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    </element>
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  </define>
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  <!-- atom:updated -->
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  <define name="atomUpdated">
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    <element name="atom:updated">
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      <ref name="atomDateConstruct"/>
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    </element>
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  </define>
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  <!-- Low-level simple types -->
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  <define name="atomNCName">
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    <data type="string">
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      <param name="minLength">1</param>
426 
      <param name="pattern">[^:]*</param>
427 
    </data>
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  </define>
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  <!-- Whatever a media type is, it contains at least one slash -->
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  <define name="atomMediaType">
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    <data type="string">
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      <param name="pattern">.+/.+</param>
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    </data>
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  </define>
435 
  <!-- As defined in RFC 3066 -->
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  <define name="atomLanguageTag">
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    <data type="string">
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      <param name="pattern">[A-Za-z]{1,8}(-[A-Za-z0-9]{1,8})*</param>
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    </data>
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  </define>
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  <!--
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    Unconstrained; it's not entirely clear how IRI fit into
443 
    xsd:anyURI so let's not try to constrain it here
444 
  -->
445 
  <define name="atomUri">
446 
    <text/>
447 
  </define>
448 
  <!-- Whatever an email address is, it contains at least one @ -->
449 
  <define name="atomEmailAddress">
450 
    <data type="string">
451 
      <param name="pattern">.+@.+</param>
452 
    </data>
453 
  </define>
454 
  <!-- Simple Extension -->
455 
  <define name="simpleExtensionElement">
456 
    <element>
457 
      <anyName>
458 
        <except>
459 
          <nsName ns="http://www.w3.org/2005/Atom"/>
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        </except>
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      </anyName>
462 
      <text/>
463 
    </element>
464 
  </define>
465 
  <!-- Structured Extension -->
466 
  <define name="structuredExtensionElement">
467 
    <element>
468 
      <anyName>
469 
        <except>
470 
          <nsName ns="http://www.w3.org/2005/Atom"/>
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        </except>
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      </anyName>
473 
      <choice>
474 
        <group>
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          <oneOrMore>
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            <attribute>
477 
              <anyName/>
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            </attribute>
479 
          </oneOrMore>
480 
          <zeroOrMore>
481 
            <choice>
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              <text/>
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              <ref name="anyElement"/>
484 
            </choice>
485 
          </zeroOrMore>
486 
        </group>
487 
        <group>
488 
          <zeroOrMore>
489 
            <attribute>
490 
              <anyName/>
491 
            </attribute>
492 
          </zeroOrMore>
493 
          <group>
494 
            <optional>
495 
              <text/>
496 
            </optional>
497 
            <oneOrMore>
498 
              <ref name="anyElement"/>
499 
            </oneOrMore>
500 
            <zeroOrMore>
501 
              <choice>
502 
                <text/>
503 
                <ref name="anyElement"/>
504 
              </choice>
505 
            </zeroOrMore>
506 
          </group>
507 
        </group>
508 
      </choice>
509 
    </element>
510 
  </define>
511 
  <!-- Other Extensibility -->
512 
  <define name="extensionElement">
513 
    <choice>
514 
      <ref name="simpleExtensionElement"/>
515 
      <ref name="structuredExtensionElement"/>
516 
    </choice>
517 
  </define>
518 
  <define name="undefinedAttribute">
519 
    <attribute>
520 
      <anyName>
521 
        <except>
522 
          <name>xml:base</name>
523 
          <name>xml:lang</name>
524 
          <nsName ns=""/>
525 
        </except>
526 
      </anyName>
527 
    </attribute>
528 
  </define>
529 
  <define name="undefinedContent">
530 
    <zeroOrMore>
531 
      <choice>
532 
        <text/>
533 
        <ref name="anyForeignElement"/>
534 
      </choice>
535 
    </zeroOrMore>
536 
  </define>
537 
  <define name="anyElement">
538 
    <element>
539 
      <anyName/>
540 
      <zeroOrMore>
541 
        <choice>
542 
          <attribute>
543 
            <anyName/>
544 
          </attribute>
545 
          <text/>
546 
          <ref name="anyElement"/>
547 
        </choice>
548 
      </zeroOrMore>
549 
    </element>
550 
  </define>
551 
  <define name="anyForeignElement">
552 
    <element>
553 
      <anyName>
554 
        <except>
555 
          <nsName ns="http://www.w3.org/2005/Atom"/>
556 
        </except>
557 
      </anyName>
558 
      <zeroOrMore>
559 
        <choice>
560 
          <attribute>
561 
            <anyName/>
562 
          </attribute>
563 
          <text/>
564 
          <ref name="anyElement"/>
565 
        </choice>
566 
      </zeroOrMore>
567 
    </element>
568 
  </define>
569 
  <!-- XHTML -->
570 
  <define name="anyXHTML">
571 
    <element>
572 
      <nsName/>
573 
      <zeroOrMore>
574 
        <choice>
575 
          <attribute>
576 
            <anyName/>
577 
          </attribute>
578 
          <text/>
579 
          <ref name="anyXHTML"/>
580 
        </choice>
581 
      </zeroOrMore>
582 
    </element>
583 
  </define>
584 
  <define name="xhtmlDiv">
585 
    <element name="xhtml:div">
586 
      <zeroOrMore>
587 
        <choice>
588 
          <attribute>
589 
            <anyName/>
590 
          </attribute>
591 
          <text/>
592 
          <ref name="anyXHTML"/>
593 
        </choice>
594 
      </zeroOrMore>
595 
    </element>
596 
  </define>
597 
</grammar>
598 
<!-- EOF -->