schema.rng

<?xml version="1.0" encoding="UTF-8"?>
<grammar 
    xmlns="http://relaxng.org/ns/structure/1.0"
    xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0"
    datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
    <start>
        <choice>
            <ref name="resource"/>
            <ref name="collection"/>
        </choice>
    </start>
    
    <define name="identifier-and-path">
        <group>
            <attribute name="identifier">
                <a:documentation>Identifier of the Collection or Resource</a:documentation>
                <data type="anyURI"/>
            </attribute>
            <optional>
                <attribute name="path">
                    <a:documentation>Path to the relevant Collection or Resource</a:documentation>
                    <data type="anyURI"/>
                </attribute>
            </optional>
        </group>
    </define>
    <define name="parent">
        <optional>
          <element name="parent">
              <a:documentation xml:lang="eng">Identifier of the parent if required by a parent
                  collection</a:documentation>
              <data type="anyURI"/>
          </element>
        </optional>
    </define>
    <define name="baseDetails">
        <element name="title">
            <a:documentation>Title / name of a Collection or Resource</a:documentation>
            <data type="string"/>
        </element>
        <optional>
            <element name="description">
                <a:documentation>Description of a Collection or Resource</a:documentation>
                <data type="string"/>
            </element>
        </optional>
    </define>
    <define name="dublinCore">
        <element name="dublinCore">
           <interleave>
               <zeroOrMore>
                  <element ns="http://purl.org/dc/terms/">
                      <a:documentation>Something</a:documentation>
                      <choice>
                          <name>abstract</name>
                          <name>accessRights</name>
                          <name>accrualMethod</name>
                          <name>accrualPeriodicity</name>
                          <name>accrualPolicy</name>
                          <name>alternative</name>
                          <name>audience</name>
                          <name>available</name>
                          <name>bibliographicCitation</name>
                          <name>conformsTo</name>
                          <name>contributor</name>
                          <name>coverage</name>
                          <name>created</name>
                          <name>creator</name>
                          <name>date</name>
                          <name>dateAccepted</name>
                          <name>dateCopyrighted</name>
                          <name>dateSubmitted</name>
                          <name>description</name>
                          <name>educationLevel</name>
                          <name>extent</name>
                          <name>format</name>
                          <name>hasFormat</name>
                          <name>hasPart</name>
                          <name>hasVersion</name>
                          <name>identifier</name>
                          <name>instructionalMethod</name>
                          <name>isFormatOf</name>
                          <name>isPartOf</name>
                          <name>isReferencedBy</name>
                          <name>isReplacedBy</name>
                          <name>isRequiredBy</name>
                          <name>issued</name>
                          <name>isVersionOf</name>
                          <name>language</name>
                          <name>license</name>
                          <name>mediator</name>
                          <name>medium</name>
                          <name>modified</name>
                          <name>provenance</name>
                          <name>publisher</name>
                          <name>references</name>
                          <name>relation</name>
                          <name>replaces</name>
                          <name>requires</name>
                          <name>rights</name>
                          <name>rightsHolder</name>
                          <name>source</name>
                          <name>spatial</name>
                          <name>subject</name>
                          <name>tableOfContents</name>
                          <name>temporal</name>
                          <name>title</name>
                          <name>type</name>
                          <name>valid</name>
                      </choice>
                      <optional>
                          <attribute name="xml:lang">
                              <data type="language"/>
                          </attribute>
                      </optional>
                      <data type="string"/>
                  </element>
               </zeroOrMore>
           </interleave>
        </element>
       
    </define>
    <define name="extension">
        <element>
            <a:documentation>Structured metadata contains any other optional metadata that are not part of
                DublinCore Terms namespace</a:documentation>
            <name>extensions</name>
            <zeroOrMore>
                <element>
                    <anyName>
                        <except>
                            <nsName ns="http://purl.org/dc/terms/"/>
                        </except>
                    </anyName>
                    <optional>
                        <attribute name="xml:lang">
                            <data type="language"/>
                        </attribute>
                    </optional>
                    <text/>
                </element>
            </zeroOrMore>
        </element>
    </define>
    <define name="members">
        <a:documentation>Children member of a collection or ressource</a:documentation>
        <element>
            <name>members</name>
             <interleave>
                 <oneOrMore>
                     <choice>
                         <ref name="collection"/>
                         <ref name="resource"/>
                         <element>
                             <a:documentation>Relative link to a secondary collection file</a:documentation>
                             <choice>
                                 <name>collection</name>
                                 <name>resource</name>
                             </choice>
                             <ref name="identifier-and-path"/>
                         </element>
                     </choice>
                 </oneOrMore>
             </interleave>
        </element>
    </define>
    <define name="collection-pattern">
        <ref name="identifier-and-path"/>
        <ref name="parent"/>
        <ref name="baseDetails"/>
        <optional>
            <ref name="dublinCore"/>
        </optional>
        <optional>
            <ref name="extension"/>
        </optional>
        <optional>
            <ref name="members"/>
        </optional>
    </define>
    <define name="resource">
        <element name="resource">
            <ref name="collection-pattern"/>
        </element>
    </define>
    <define name="collection">
        <element name="collection">
            <ref name="collection-pattern"/>
        </element>
    </define>
</grammar>