function

<attribute name="function" use="optional">
  <annotation>
    <documentation>Job function of individual performing revision.</documentation>
  </annotation>
  <simpleType>
    <restriction base="string">
      <enumeration value="writer-author"/>
      <enumeration value="editor"/>
      <enumeration value="producer"/>
      <enumeration value="archivist"/>
      <enumeration value="videographer"/>
      <enumeration value="graphic-artist"/>
      <enumeration value="photographer"/>
      <enumeration value="statistician"/>
      <enumeration value="other"/>
    </restriction>
  </simpleType>
</attribute>