ifc:IfcTransformerTypeEnum

<xs:simpleType name="IfcTransformerTypeEnum">
  <xs:restriction base="xs:string">
    <xs:enumeration value="current"/>
    <xs:enumeration value="frequency"/>
    <xs:enumeration value="inverter"/>
    <xs:enumeration value="rectifier"/>
    <xs:enumeration value="voltage"/>
    <xs:enumeration value="userdefined"/>
    <xs:enumeration value="notdefined"/>
  </xs:restriction>
</xs:simpleType>