<xs:schema targetNamespace="http://ltsc.ieee.org/xsd/LOM"
           xmlns="http://ltsc.ieee.org/xsd/LOM"
           xmlns:ag="http://ltsc.ieee.org/xsd/LOM/unique"
           xmlns:ex="http://ltsc.ieee.org/xsd/LOM/extend"
           xmlns:xs="http://www.w3.org/2001/XMLSchema"
           elementFormDefault="qualified"
           version="IEEE LTSC LOM XML 1.0">

  <xs:annotation>
    <xs:documentation>
       This work is licensed under the Creative Commons Attribution-ShareAlike
       License.  To view a copy of this license, see the file license.txt,
       visit http://creativecommons.org/licenses/by-sa/1.0 or send a letter to
       Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
    </xs:documentation>

    <xs:documentation>
       This component schema provides global type declarations for metadata elements.
    </xs:documentation>
  </xs:annotation>

  <xs:import namespace="http://ltsc.ieee.org/xsd/LOM/unique"/>
  <xs:import namespace="http://ltsc.ieee.org/xsd/LOM/extend"/>

  <!-- Element type declarations -->

  <!-- Learning Object Metadata -->
  <xs:complexType name="lom">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="general"/>
      <xs:group ref="lifeCycle"/>
      <xs:group ref="metaMetadata"/>
      <xs:group ref="technical"/>
      <xs:group ref="educational"/>
      <xs:group ref="rights"/>
      <xs:group ref="relation"/>
      <xs:group ref="annotation"/>
      <xs:group ref="classification"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:lom"/>
  </xs:complexType>

  <!-- 1 General -->
  <xs:complexType name="general">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="identifier"/>
      <xs:group ref="title"/>
      <xs:group ref="languageIdOrNone"/>
      <xs:group ref="descriptionUnbounded"/>
      <xs:group ref="keyword"/>
      <xs:group ref="coverage"/>
      <xs:group ref="structure"/>
      <xs:group ref="aggregationLevel"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:general"/>
  </xs:complexType>

  <!-- 1.1 Identifier -->
  <xs:complexType name="identifier">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="catalog"/>
      <xs:group ref="entry"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:identifier"/>
  </xs:complexType>

  <!-- 1.1.1 Catalog -->
  <xs:complexType name="catalog">
    <xs:simpleContent>
      <xs:extension base="CharacterString">
        <xs:attributeGroup ref="ag:catalog"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- 1.1.2 Entry -->
  <xs:complexType name="entry">
    <xs:simpleContent>
      <xs:extension base="CharacterString">
        <xs:attributeGroup ref="ag:entry"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- 1.2 Title -->
  <xs:complexType name="title">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:title"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 1.3 Language
  <xs:complexType name="language">
    <xs:simpleContent>
      <xs:extension base="LanguageIdOrNone">
        <xs:attributeGroup ref="ag:language"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType> -->

  <!-- 1.4 Description
  <xs:complexType name="description">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:description"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType> -->

  <!-- 1.5 Keyword -->
  <xs:complexType name="keyword">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:keyword"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 1.6 Coverage -->
  <xs:complexType name="coverage">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:coverage"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 1.7 Structure -->
  <xs:complexType name="structure">
    <xs:complexContent>
      <xs:extension base="structureVocab">
        <xs:attributeGroup ref="ag:structure"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 1.8 Aggregation Level -->
  <xs:complexType name="aggregationLevel">
    <xs:complexContent>
      <xs:extension base="aggregationLevelVocab">
        <xs:attributeGroup ref="ag:aggregationLevel"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 2 Life Cycle -->
  <xs:complexType name="lifeCycle">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="version"/>
      <xs:group ref="status"/>
      <xs:group ref="contribute"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:lifeCycle"/>
  </xs:complexType>

  <!-- 2.1 Version -->
  <xs:complexType name="version">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:version"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 2.2 Status -->
  <xs:complexType name="status">
    <xs:complexContent>
      <xs:extension base="statusVocab">
        <xs:attributeGroup ref="ag:status"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 2.3 Contribute -->
  <xs:complexType name="contribute">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="role"/>
      <xs:group ref="entityUnbounded"/>
      <xs:group ref="date"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:contribute"/>
  </xs:complexType>

  <!-- 2.3.1 Role -->
  <xs:complexType name="role">
    <xs:complexContent>
      <xs:extension base="roleVocab">
        <xs:attributeGroup ref="ag:role"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 2.3.2 Entity
  <xs:complexType name="entity">
    <xs:simpleContent>
      <xs:extension base="VCard">
        <xs:attributeGroup ref="ag:entity"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType> -->

  <!-- 2.3.3 Date -->
  <xs:complexType name="date">
    <xs:complexContent>
      <xs:extension base="DateTime">
        <xs:attributeGroup ref="ag:date"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 3 Meta-Metadata -->
  <xs:complexType name="metaMetadata">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="identifier"/>
      <xs:group ref="contributeMeta"/>
      <xs:group ref="metadataSchema"/>
      <xs:group ref="language"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:metaMetadata"/>
  </xs:complexType>

  <!-- 3.1 Identifier
  <xs:complexType name="identifier">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="catalog"/>
      <xs:group ref="entry"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:identifier"/>
  </xs:complexType> -->

  <!-- 3.1.1 Catalog
  <xs:complexType name="catalog">
    <xs:simpleContent>
      <xs:extension base="CharacterString">
        <xs:attributeGroup ref="ag:catalog"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType> -->

  <!-- 3.1.2 Entry
  <xs:complexType name="entry">
    <xs:simpleContent>
      <xs:extension base="CharacterString">
        <xs:attributeGroup ref="ag:entry"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType> -->

  <!-- 3.2 Contribute -->
  <xs:complexType name="contributeMeta">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="roleMeta"/>
      <xs:group ref="entityUnbounded"/>
      <xs:group ref="date"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:contribute"/>
  </xs:complexType>

  <!-- 3.2.1 Role -->
  <xs:complexType name="roleMeta">
    <xs:complexContent>
      <xs:extension base="roleMetaVocab">
        <xs:attributeGroup ref="ag:role"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 3.2.2 Entity
  <xs:complexType name="entity">
    <xs:simpleContent>
      <xs:extension base="VCard">
        <xs:attributeGroup ref="ag:entity"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType> -->

  <!-- 3.2.3 Date
  <xs:complexType name="date">
    <xs:complexContent>
      <xs:extension base="DateTime">
        <xs:attributeGroup ref="ag:date"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType> -->

  <!-- 3.3 Metadata Schema -->
  <xs:complexType name="metadataSchema">
    <xs:simpleContent>
      <xs:extension base="CharacterString">
        <xs:attributeGroup ref="ag:metadataSchema"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- 3.4 Language -->
  <xs:complexType name="language">
    <xs:simpleContent>
      <xs:extension base="LanguageId">
        <xs:attributeGroup ref="ag:language"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- 4 Technical -->
  <xs:complexType name="technical">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="format"/>
      <xs:group ref="size"/>
      <xs:group ref="location"/>
      <xs:group ref="requirement"/>
      <xs:group ref="installationRemarks"/>
      <xs:group ref="otherPlatformRequirements"/>
      <xs:group ref="duration"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:technical"/>
  </xs:complexType>

  <!-- 4.1 Format -->
  <xs:complexType name="format">
    <xs:simpleContent>
      <xs:extension base="MimeType">
        <xs:attributeGroup ref="ag:format"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- 4.2 Size -->
  <xs:complexType name="size">
    <xs:simpleContent>
      <xs:extension base="Size">
        <xs:attributeGroup ref="ag:size"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- 4.3 Location -->
  <xs:complexType name="location">
    <xs:simpleContent>
      <xs:extension base="CharacterString">
        <xs:attributeGroup ref="ag:location"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- 4.4 Requirement -->
  <xs:complexType name="requirement">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="orComposite"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:requirement"/>
  </xs:complexType>

  <!-- 4.4.1 OrComposite -->
  <xs:complexType name="orComposite">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="type"/>
      <xs:group ref="name"/>
      <xs:group ref="minimumVersion"/>
      <xs:group ref="maximumVersion"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:orComposite"/>
  </xs:complexType>

  <!-- 4.4.1.1 Type -->
  <xs:complexType name="type">
    <xs:complexContent>
      <xs:extension base="typeVocab">
        <xs:attributeGroup ref="ag:type"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 4.4.1.2 Name -->
  <xs:complexType name="name">
    <xs:complexContent>
      <xs:extension base="nameVocab">
        <xs:attributeGroup ref="ag:name"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 4.4.1.3 Minimum Version -->
  <xs:complexType name="minimumVersion">
    <xs:simpleContent>
      <xs:extension base="CharacterString">
        <xs:attributeGroup ref="ag:minimumVersion"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- 4.4.1.4 Maximum Version -->
  <xs:complexType name="maximumVersion">
    <xs:simpleContent>
      <xs:extension base="CharacterString">
        <xs:attributeGroup ref="ag:maximumVersion"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- 4.5 Installation Remarks -->
  <xs:complexType name="installationRemarks">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:installationRemarks"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 4.6 Other Platform Requirements -->
  <xs:complexType name="otherPlatformRequirements">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:otherPlatformRequirements"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 4.7 Duration -->
  <xs:complexType name="duration">
    <xs:complexContent>
      <xs:extension base="Duration">
        <xs:attributeGroup ref="ag:duration"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 5 Educational -->
  <xs:complexType name="educational">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="interactivityType"/>
      <xs:group ref="learningResourceType"/>
      <xs:group ref="interactivityLevel"/>
      <xs:group ref="semanticDensity"/>
      <xs:group ref="intendedEndUserRole"/>
      <xs:group ref="context"/>
      <xs:group ref="typicalAgeRange"/>
      <xs:group ref="difficulty"/>
      <xs:group ref="typicalLearningTime"/>
      <xs:group ref="descriptionUnbounded"/>
      <xs:group ref="languageId"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:educational"/>
  </xs:complexType>

  <!-- 5.1 Interactivity Type -->
  <xs:complexType name="interactivityType">
    <xs:complexContent>
      <xs:extension base="interactivityTypeVocab">
        <xs:attributeGroup ref="ag:interactivityType"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 5.2 Learning Resource Type -->
  <xs:complexType name="learningResourceType">
    <xs:complexContent>
      <xs:extension base="learningResourceTypeVocab">
        <xs:attributeGroup ref="ag:learningResourceType"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 5.3 Interactivity Level -->
  <xs:complexType name="interactivityLevel">
    <xs:complexContent>
      <xs:extension base="interactivityLevelVocab">
        <xs:attributeGroup ref="ag:interactivityLevel"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 5.4 Semantic Density -->
  <xs:complexType name="semanticDensity">
    <xs:complexContent>
      <xs:extension base="semanticDensityVocab">
        <xs:attributeGroup ref="ag:semanticDensity"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 5.5 Intended End User Role -->
  <xs:complexType name="intendedEndUserRole">
    <xs:complexContent>
      <xs:extension base="intendedEndUserRoleVocab">
        <xs:attributeGroup ref="ag:intendedEndUserRole"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 5.6 Context -->
  <xs:complexType name="context">
    <xs:complexContent>
      <xs:extension base="contextVocab">
        <xs:attributeGroup ref="ag:context"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 5.7 Typical Age Range -->
  <xs:complexType name="typicalAgeRange">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:typicalAgeRange"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 5.8 Difficulty -->
  <xs:complexType name="difficulty">
    <xs:complexContent>
      <xs:extension base="difficultyVocab">
        <xs:attributeGroup ref="ag:difficulty"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 5.9 Typical Learning Time -->
  <xs:complexType name="typicalLearningTime">
    <xs:complexContent>
      <xs:extension base="Duration">
        <xs:attributeGroup ref="ag:typicalLearningTime"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 5.10 Description
  <xs:complexType name="description">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:description"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType> -->

  <!-- 5.11 Language
  <xs:complexType name="language">
    <xs:simpleContent>
      <xs:extension base="LanguageId">
        <xs:attributeGroup ref="ag:language"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType> -->

  <!-- 6 Rights -->
  <xs:complexType name="rights">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="cost"/>
      <xs:group ref="copyrightAndOtherRestrictions"/>
      <xs:group ref="description"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:rights"/>
  </xs:complexType>

  <!-- 6.1 Cost -->
  <xs:complexType name="cost">
    <xs:complexContent>
      <xs:extension base="costVocab">
        <xs:attributeGroup ref="ag:cost"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 6.2 Copyright and Other Restrictions -->
  <xs:complexType name="copyrightAndOtherRestrictions">
    <xs:complexContent>
      <xs:extension base="copyrightAndOtherRestrictionsVocab">
        <xs:attributeGroup ref="ag:copyrightAndOtherRestrictions"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 6.3 Description -->
  <xs:complexType name="description">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:description"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 7 Relation -->
  <xs:complexType name="relation">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="kind"/>
      <xs:group ref="resource"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:relation"/>
  </xs:complexType>

  <!-- 7.1 Kind -->
  <xs:complexType name="kind">
    <xs:complexContent>
      <xs:extension base="kindVocab">
        <xs:attributeGroup ref="ag:kind"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 7.2 Resource -->
  <xs:complexType name="resource">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="identifier"/>
      <xs:group ref="description"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:resource"/>
  </xs:complexType>

  <!-- 7.2.1 Identifier
  <xs:complexType name="identifier">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="catalog"/>
      <xs:group ref="entry"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:identifier"/>
  </xs:complexType> -->

  <!-- 7.2.1.1 Catalog
  <xs:complexType name="catalog">
    <xs:simpleContent>
      <xs:extension base="CharacterString">
        <xs:attributeGroup ref="ag:catalog"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType> -->

  <!-- 7.2.1.2 Entry
  <xs:complexType name="entry">
    <xs:simpleContent>
      <xs:extension base="CharacterString">
        <xs:attributeGroup ref="ag:entry"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType> -->

  <!-- 7.2.2 Description
  <xs:complexType name="description">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:description"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType> -->

  <!-- 8 Annotation -->
  <xs:complexType name="annotation">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="entity"/>
      <xs:group ref="date"/>
      <xs:group ref="description"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:annotation"/>
  </xs:complexType>

  <!-- 8.1 Entity -->
  <xs:complexType name="entity">
    <xs:simpleContent>
      <xs:extension base="VCard">
        <xs:attributeGroup ref="ag:entity"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- 8.2 Date
  <xs:complexType name="date">
    <xs:complexContent>
      <xs:extension base="DateTime">
        <xs:attributeGroup ref="ag:date"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType> -->

  <!-- 8.3 Description
  <xs:complexType name="description">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:description"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType> -->

  <!-- 9 Classification -->
  <xs:complexType name="classification">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="purpose"/>
      <xs:group ref="taxonPath"/>
      <xs:group ref="description"/>
      <xs:group ref="keyword"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:classification"/>
  </xs:complexType>

  <!-- 9.1 Purpose -->
  <xs:complexType name="purpose">
    <xs:complexContent>
      <xs:extension base="purposeVocab">
        <xs:attributeGroup ref="ag:purpose"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 9.2 Taxon Path -->
  <xs:complexType name="taxonPath">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="source"/>
      <xs:group ref="taxon"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:taxonPath"/>
  </xs:complexType>

  <!-- 9.2.1 Source -->
  <xs:complexType name="source">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:source"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 9.2.2 Taxon -->
  <xs:complexType name="taxon">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:group ref="id"/>
      <xs:group ref="entryTaxon"/>
      <xs:group ref="ex:customElements"/>
    </xs:choice>
    <xs:attributeGroup ref="ag:taxon"/>
  </xs:complexType>

  <!-- 9.2.2.1 Id -->
  <xs:complexType name="id">
    <xs:simpleContent>
      <xs:extension base="CharacterString">
        <xs:attributeGroup ref="ag:id"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <!-- 9.2.2.2 Entry -->
  <xs:complexType name="entryTaxon">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:entry"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <!-- 9.3 Description
  <xs:complexType name="description">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:description"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType> -->

  <!-- 9.4 Keyword
  <xs:complexType name="keyword">
    <xs:complexContent>
      <xs:extension base="LangString">
        <xs:attributeGroup ref="ag:keyword"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType> -->

</xs:schema>
