<xs:attribute name="SubjectClassificationScheme">
  <xs:annotation>
    <xs:documentation xml:lang="en">A classification scheme used for subjects/topics devised by an authority or organization</xs:documentation>
    <xs:appinfo>
      <identifier>http://w3id.org/meta-share/meta-share/SubjectClassificationScheme</identifier>
      <label xml:lang="en">Subject classification scheme</label>
      <subclassOf>http://w3id.org/meta-share/meta-share/ClassificationScheme</subclassOf>
    </xs:appinfo>
  </xs:annotation>
  <xs:simpleType>
    <xs:restriction base="xs:anyURI">
      <xs:enumeration value="http://w3id.org/meta-share/meta-share/MeSH_classification">
        <xs:annotation>
          <xs:appinfo>
            <identifier>http://w3id.org/meta-share/meta-share/MeSH_classification</identifier>
            <label xml:lang="en">MeSH</label>
          </xs:appinfo>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="http://w3id.org/meta-share/meta-share/NLM_classification">
        <xs:annotation>
          <xs:documentation xml:lang="en">Classification scheme of the National Library of Medicine (https://www.nlm.nih.gov/class/)</xs:documentation>
          <xs:appinfo>
            <identifier>http://w3id.org/meta-share/meta-share/NLM_classification</identifier>
            <label xml:lang="en">NLM classification scheme</label>
          </xs:appinfo>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="http://w3id.org/meta-share/meta-share/PAROLE_topicClassification">
        <xs:annotation>
          <xs:appinfo>
            <identifier>http://w3id.org/meta-share/meta-share/PAROLE_topicClassification</identifier>
            <label xml:lang="en">PAROLE_topic classification scheme</label>
          </xs:appinfo>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="http://w3id.org/meta-share/meta-share/libraryofCongressSubjectHeadings_classification">
        <xs:annotation>
          <xs:appinfo>
            <identifier>http://w3id.org/meta-share/meta-share/libraryofCongressSubjectHeadings_classification</identifier>
            <label xml:lang="en">LCSH</label>
          </xs:appinfo>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="http://w3id.org/meta-share/meta-share/other">
        <xs:annotation>
          <xs:appinfo>
            <identifier>http://w3id.org/meta-share/meta-share/other</identifier>
            <label xml:lang="en">other</label>
          </xs:appinfo>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>