<xs:simpleType name="taskStatusType">
  <xs:annotation>
    <xs:documentation>The status of a task (can be not started, in progress, suspended or completed)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="not_started"/>
    <xs:enumeration value="in_progress"/>
    <xs:enumeration value="suspended"/>
    <xs:enumeration value="completed"/>
  </xs:restriction>
</xs:simpleType>