roleValues

<xs:simpleType name="roleValues">
  <xs:restriction base="xs:token">
    <xs:enumeration value="author"/>
    <xs:enumeration value="publisher"/>
    <xs:enumeration value="unknown"/>
    <xs:enumeration value="initiator"/>
    <xs:enumeration value="terminator"/>
    <xs:enumeration value="validator"/>
    <xs:enumeration value="editor"/>
    <xs:enumeration value="graphical designer"/>
    <xs:enumeration value="technical implementer"/>
    <xs:enumeration value="content provider"/>
    <xs:enumeration value="technical validator"/>
    <xs:enumeration value="educational validator"/>
    <xs:enumeration value="script writer"/>
    <xs:enumeration value="instructional designer"/>
    <xs:enumeration value="subject matter expert"/>
  </xs:restriction>
</xs:simpleType>