<xs:simpleType name="dependencyModeType">
  <xs:annotation>
    <xs:documentation>The relationship between two tasks (can be finish-finish, finish-start, start-finish and start-start)</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:NMTOKEN">
    <xs:enumeration value="finish_finish"/>
    <xs:enumeration value="finish_start"/>
    <xs:enumeration value="start_finish"/>
    <xs:enumeration value="start_start"/>
  </xs:restriction>
</xs:simpleType>