<xs:attribute name="ProjectIdentifierScheme">
  <xs:annotation>
    <xs:documentation xml:lang="en">The name of the scheme according to which an identifier is assigned to a project by the authority that issues it</xs:documentation>
    <xs:appinfo>
      <identifier>http://w3id.org/meta-share/meta-share/ProjectIdentifierScheme</identifier>
      <label xml:lang="en">Project identifier scheme</label>
      <subclassOf>http://purl.org/spar/datacite/ResourceIdentifierScheme</subclassOf>
    </xs:appinfo>
  </xs:annotation>
  <xs:simpleType>
    <xs:restriction base="xs:anyURI">
      <xs:enumeration value="http://w3id.org/meta-share/meta-share/cordis">
        <xs:annotation>
          <xs:appinfo>
            <identifier>http://w3id.org/meta-share/meta-share/cordis</identifier>
            <label xml:lang="en">cordis</label>
          </xs:appinfo>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="http://w3id.org/meta-share/meta-share/elg">
        <xs:annotation>
          <xs:documentation xml:lang="en">European Language Grid</xs:documentation>
          <xs:appinfo>
            <identifier>http://w3id.org/meta-share/meta-share/elg</identifier>
            <label xml:lang="en">ELG</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>