<xs:schema targetNamespace="http://ltsc.ieee.org/xsd/LOM"
           xmlns="http://ltsc.ieee.org/xsd/LOM"
           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 element name declarations for metadata elements.

         This component schema checks for the uniqueness of elements declared to be unique
         within their parent by the presence of the uniqueElementName attribute,
         and is common to all uniqueness profiles.
      </xs:documentation>
   </xs:annotation>

   <!-- Element declarations -->

   <!-- Duplicate declarations are included as comments. -->

   <!-- 1 General -->
   <xs:group name="general">
      <xs:sequence>
         <xs:element name="general" type="general">
            <xs:unique name="generalUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 1.1 Identifier -->
   <xs:group name="identifier">
      <xs:sequence>
         <xs:element name="identifier" type="identifier">
            <xs:unique name="identifierUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 1.1.1 Catalog -->
   <xs:group name="catalog">
      <xs:sequence>
         <xs:element name="catalog" type="catalog"/>
      </xs:sequence>
   </xs:group>

   <!-- 1.1.2 Entry -->
   <xs:group name="entry">
      <xs:sequence>
         <xs:element name="entry" type="entry"/>
      </xs:sequence>
   </xs:group>

   <!-- 1.2 Title -->
   <xs:group name="title">
      <xs:sequence>
         <xs:element name="title" type="title"/>
      </xs:sequence>
   </xs:group>

   <!-- 1.3 Language -->
   <xs:group name="languageIdOrNone">
      <xs:sequence>
         <xs:element name="language" type="LanguageIdOrNone"/>
      </xs:sequence>
   </xs:group>

   <!-- 1.4 Description -->
   <xs:group name="descriptionUnbounded">
      <xs:sequence>
         <xs:element name="description" type="LangString"/>
      </xs:sequence>
   </xs:group>

   <!-- 1.5 Keyword -->
   <xs:group name="keyword">
      <xs:sequence>
         <xs:element name="keyword" type="keyword"/>
      </xs:sequence>
   </xs:group>

   <!-- 1.6 Coverage -->
   <xs:group name="coverage">
      <xs:sequence>
         <xs:element name="coverage" type="coverage"/>
      </xs:sequence>
   </xs:group>

   <!-- 1.7 Structure -->
   <xs:group name="structure">
      <xs:sequence>
         <xs:element name="structure" type="structure">
            <xs:unique name="structureUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 1.8 Aggregation Level -->
   <xs:group name="aggregationLevel">
      <xs:sequence>
         <xs:element name="aggregationLevel" type="aggregationLevel">
            <xs:unique name="aggregationLevelUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 2 Life Cycle -->
   <xs:group name="lifeCycle">
      <xs:sequence>
         <xs:element name="lifeCycle" type="lifeCycle">
            <xs:unique name="lifeCycleUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 2.1 Version -->
   <xs:group name="version">
      <xs:sequence>
         <xs:element name="version" type="version"/>
      </xs:sequence>
   </xs:group>

   <!-- 2.2 Status -->
   <xs:group name="status">
      <xs:sequence>
         <xs:element name="status" type="status">
            <xs:unique name="statusUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 2.3 Contribute -->
   <xs:group name="contribute">
      <xs:sequence>
         <xs:element name="contribute" type="contribute">
            <xs:unique name="contributeUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 2.3.1 Role -->
   <xs:group name="role">
      <xs:sequence>
         <xs:element name="role" type="role">
            <xs:unique name="roleUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 2.3.2 Entity -->
   <xs:group name="entityUnbounded">
      <xs:sequence>
         <xs:element name="entity" type="VCard"/>
      </xs:sequence>
   </xs:group>

  <!-- 2.3.3 Date -->
  <xs:group name="date">
     <xs:sequence>
        <xs:element name="date" type="date">
           <xs:unique name="dateUnique">
              <xs:selector xpath="*"/>
              <xs:field xpath="@uniqueElementName"/>
           </xs:unique>
        </xs:element>
     </xs:sequence>
   </xs:group>

   <!-- 3 Meta-Metadata -->
   <xs:group name="metaMetadata">
      <xs:sequence>
         <xs:element name="metaMetadata" type="metaMetadata">
            <xs:unique name="metaMetadataUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 3.1 Identifier
   <xs:group name="identifier">
      <xs:sequence>
         <xs:element name="identifier" type="identifier">
            <xs:unique name="identifierUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group> -->

   <!-- 3.1.1 Catalog
   <xs:group name="catalog">
      <xs:sequence>
         <xs:element name="catalog" type="catalog"/>
      </xs:sequence>
   </xs:group> -->

   <!-- 3.1.2 Entry
   <xs:group name="entry">
      <xs:sequence>
         <xs:element name="entry" type="entry"/>
      </xs:sequence>
   </xs:group> -->

   <!-- 3.2 Contribute -->
   <xs:group name="contributeMeta">
      <xs:sequence>
         <xs:element name="contribute" type="contributeMeta">
            <xs:unique name="contributeMetaUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 3.2.1 Role -->
   <xs:group name="roleMeta">
      <xs:sequence>
         <xs:element name="role" type="roleMeta">
            <xs:unique name="roleMetaUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 3.2.2 Entity
   <xs:group name="entityUnbounded">
      <xs:sequence>
         <xs:element name="entity" type="VCard"/>
      </xs:sequence>
   </xs:group> -->

   <!-- 3.2.3 Date
   <xs:group name="date">
      <xs:sequence>
         <xs:element name="date" type="date">
            <xs:unique name="dateUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group> -->

   <!-- 3.3 Metadata Schema -->
   <xs:group name="metadataSchema">
      <xs:sequence>
         <xs:element name="metadataSchema" type="metadataSchema"/>
      </xs:sequence>
   </xs:group>

   <!-- 3.4 Language -->
   <xs:group name="language">
      <xs:sequence>
         <xs:element name="language" type="language"/>
      </xs:sequence>
   </xs:group>

   <!-- 4 Technical -->
   <xs:group name="technical">
      <xs:sequence>
         <xs:element name="technical" type="technical">
            <xs:unique name="technicalUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 4.1 Format -->
  <xs:group name="format">
      <xs:sequence>
         <xs:element name="format" type="format"/>
      </xs:sequence>
   </xs:group>

   <!-- 4.2 Size -->
   <xs:group name="size">
      <xs:sequence>
         <xs:element name="size" type="size"/>
      </xs:sequence>
   </xs:group>

   <!-- 4.3 Location -->
   <xs:group name="location">
      <xs:sequence>
         <xs:element name="location" type="location"/>
      </xs:sequence>
   </xs:group>

   <!-- 4.4 Requirement -->
   <xs:group name="requirement">
      <xs:sequence>
         <xs:element name="requirement" type="requirement"/>
      </xs:sequence>
   </xs:group>

   <!-- 4.4.1 OrComposite -->
   <xs:group name="orComposite">
      <xs:sequence>
         <xs:element name="orComposite" type="orComposite">
            <xs:unique name="orCompositeUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 4.4.1.1 Type -->
   <xs:group name="type">
      <xs:sequence>
         <xs:element name="type" type="type">
            <xs:unique name="typeUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 4.4.1.2 Name -->
   <xs:group name="name">
      <xs:sequence>
         <xs:element name="name" type="name">
            <xs:unique name="nameUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 4.4.1.3 Minimum Version -->
   <xs:group name="minimumVersion">
      <xs:sequence>
         <xs:element name="minimumVersion" type="minimumVersion"/>
      </xs:sequence>
   </xs:group>

   <!-- 4.4.1.4 Maximum Version -->
   <xs:group name="maximumVersion">
      <xs:sequence>
         <xs:element name="maximumVersion" type="maximumVersion"/>
      </xs:sequence>
    </xs:group>

   <!-- 4.5 Installation Remarks -->
   <xs:group name="installationRemarks">
      <xs:sequence>
         <xs:element name="installationRemarks" type="installationRemarks"/>
      </xs:sequence>
   </xs:group>

   <!-- 4.6 Other Platform Requirements -->
   <xs:group name="otherPlatformRequirements">
      <xs:sequence>
         <xs:element name="otherPlatformRequirements" type="otherPlatformRequirements"/>
      </xs:sequence>
   </xs:group>

   <!-- 4.7 Duration -->
   <xs:group name="duration">
      <xs:sequence>
         <xs:element name="duration" type="duration">
            <xs:unique name="durationUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 5 Educational -->
   <xs:group name="educational">
      <xs:sequence>
         <xs:element name="educational" type="educational">
            <xs:unique name="educationalUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 5.1 Interactivity Type -->
   <xs:group name="interactivityType">
      <xs:sequence>
         <xs:element name="interactivityType" type="interactivityType">
            <xs:unique name="interactivityTypeUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 5.2 Learning Resource Type -->
   <xs:group name="learningResourceType">
      <xs:sequence>
         <xs:element name="learningResourceType" type="learningResourceType">
            <xs:unique name="learningResourceTypeUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 5.3 Interactivity Level -->
   <xs:group name="interactivityLevel">
      <xs:sequence>
         <xs:element name="interactivityLevel" type="interactivityLevel">
            <xs:unique name="interactivityLevelUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 5.4 Semantic Density -->
   <xs:group name="semanticDensity">
      <xs:sequence>
         <xs:element name="semanticDensity" type="semanticDensity">
            <xs:unique name="semanticDensityUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 5.5 Intended End User Role -->
   <xs:group name="intendedEndUserRole">
      <xs:sequence>
         <xs:element name="intendedEndUserRole" type="intendedEndUserRole">
            <xs:unique name="intendedEndUserRoleUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 5.6 Context -->
   <xs:group name="context">
      <xs:sequence>
         <xs:element name="context" type="context">
            <xs:unique name="contextUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 5.7 Typical Age Range -->
   <xs:group name="typicalAgeRange">
      <xs:sequence>
         <xs:element name="typicalAgeRange" type="typicalAgeRange"/>
      </xs:sequence>
   </xs:group>
  
   <!-- 5.8 Difficulty -->
   <xs:group name="difficulty">
      <xs:sequence>
         <xs:element name="difficulty" type="difficulty">
            <xs:unique name="difficultyUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 5.9 Typical Learning Time -->
   <xs:group name="typicalLearningTime">
      <xs:sequence>
         <xs:element name="typicalLearningTime" type="typicalLearningTime">
            <xs:unique name="typicalLearningTimeUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 5.10 Description
   <xs:group name="descriptionUnbounded">
      <xs:sequence>
         <xs:element name="description" type="LangString"/>
      </xs:sequence>
   </xs:group> -->

   <!-- 5.11 Language -->
   <xs:group name="languageId">
      <xs:sequence>
         <xs:element name="language" type="LanguageId"/>
      </xs:sequence>
   </xs:group>

   <!-- 6 Rights -->
   <xs:group name="rights">
      <xs:sequence>
         <xs:element name="rights" type="rights">
            <xs:unique name="rightsUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 6.1 Cost -->
   <xs:group name="cost">
      <xs:sequence>
         <xs:element name="cost" type="cost">
            <xs:unique name="costUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 6.2 Copyright and Other Restrictions -->
   <xs:group name="copyrightAndOtherRestrictions">
      <xs:sequence>
         <xs:element name="copyrightAndOtherRestrictions" type="copyrightAndOtherRestrictions">
            <xs:unique name="copyrightAndOtherRestrictionsUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 6.3 Description -->
   <xs:group name="description">
      <xs:sequence>
         <xs:element name="description" type="description"/>
      </xs:sequence>
   </xs:group>

   <!-- 7 Relation -->
   <xs:group name="relation">
      <xs:sequence>
         <xs:element name="relation" type="relation">
            <xs:unique name="relationUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 7.1 Kind -->
   <xs:group name="kind">
      <xs:sequence>
         <xs:element name="kind" type="kind">
            <xs:unique name="kindUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 7.2 Resource -->
   <xs:group name="resource">
      <xs:sequence>
         <xs:element name="resource" type="resource"/>
      </xs:sequence>
   </xs:group>

   <!-- 7.2.1 Identifier
   <xs:group name="identifier">
      <xs:sequence>
         <xs:element name="identifier" type="identifier">
            <xs:unique name="identifierUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group> -->

   <!-- 7.2.1.1 Catalog
   <xs:group name="catalog">
      <xs:sequence>
         <xs:element name="catalog" type="catalog"/>
      </xs:sequence>
   </xs:group> -->

   <!-- 7.2.1.2 Entry
   <xs:group name="entry">
      <xs:sequence>
         <xs:element name="entry" type="entry"/>
      </xs:sequence>
   </xs:group> -->

   <!-- 7.2.2 Description
   <xs:group name="description">
      <xs:sequence>
         <xs:element name="description" type="description"/>
      </xs:sequence>
   </xs:group> -->

   <!-- 8 Annotation -->
   <xs:group name="annotation">
      <xs:sequence>
         <xs:element name="annotation" type="annotation">
            <xs:unique name="annotationUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 8.1 Entity -->
   <xs:group name="entity">
      <xs:sequence>
         <xs:element name="entity" type="entity"/>
      </xs:sequence>
   </xs:group>

   <!-- 8.2 Date
   <xs:group name="date">
      <xs:sequence>
         <xs:element name="date" type="date">
            <xs:unique name="dateUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group> -->

   <!-- 8.3 Description
   <xs:group name="description">
      <xs:sequence>
         <xs:element name="description" type="description"/>
      </xs:sequence>
   </xs:group> -->

   <!-- 9 Classification -->
   <xs:group name="classification">
      <xs:sequence>
         <xs:element name="classification" type="classification">
            <xs:unique name="classificationUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 9.1 Purpose -->
   <xs:group name="purpose">
      <xs:sequence>
         <xs:element name="purpose" type="purpose">
            <xs:unique name="purposeUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 9.2 Taxon Path -->
   <xs:group name="taxonPath">
      <xs:sequence>
         <xs:element name="taxonPath" type="taxonPath">
            <xs:unique name="taxonPathUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 9.2.1 Source -->
   <xs:group name="source">
      <xs:sequence>
         <xs:element name="source" type="source"/>
      </xs:sequence>
   </xs:group>

   <!-- 9.2.2 Taxon -->
   <xs:group name="taxon">
      <xs:sequence>
         <xs:element name="taxon" type="taxon">
            <xs:unique name="taxonUnique">
               <xs:selector xpath="*"/>
               <xs:field xpath="@uniqueElementName"/>
            </xs:unique>
         </xs:element>
      </xs:sequence>
   </xs:group>

   <!-- 9.2.2.1 Id -->
   <xs:group name="id">
      <xs:sequence>
         <xs:element name="id" type="id"/>
      </xs:sequence>
   </xs:group>

   <!-- 9.2.2.2 Entry -->
   <xs:group name="entryTaxon">
      <xs:sequence>
         <xs:element name="entry" type="entryTaxon"/>
      </xs:sequence>
   </xs:group>

   <!-- 9.3 Description
   <xs:group name="description">
      <xs:sequence>
         <xs:element name="description" type="description"/>
      </xs:sequence>
   </xs:group> -->

   <!-- 9.4 Keyword
   <xs:group name="keyword">
      <xs:sequence>
         <xs:element name="keyword" type="keyword"/>
      </xs:sequence>
   </xs:group> -->

</xs:schema>