ifc:IfcActionRequestTypeEnum

<xs:simpleType name="IfcActionRequestTypeEnum">
  <xs:restriction base="xs:string">
    <xs:enumeration value="email"/>
    <xs:enumeration value="fax"/>
    <xs:enumeration value="phone"/>
    <xs:enumeration value="post"/>
    <xs:enumeration value="verbal"/>
    <xs:enumeration value="userdefined"/>
    <xs:enumeration value="notdefined"/>
  </xs:restriction>
</xs:simpleType>