<xs:simpleType name="IfcUnitEnum">
    <xs:restriction base="xs:string">
        <xs:enumeration value="absorbeddoseunit" />
        <xs:enumeration value="amountofsubstanceunit" />
        <xs:enumeration value="areaunit" />
        <xs:enumeration value="doseequivalentunit" />
        <xs:enumeration value="electriccapacitanceunit" />
        <xs:enumeration value="electricchargeunit" />
        <xs:enumeration value="electricconductanceunit" />
        <xs:enumeration value="electriccurrentunit" />
        <xs:enumeration value="electricresistanceunit" />
        <xs:enumeration value="electricvoltageunit" />
        <xs:enumeration value="energyunit" />
        <xs:enumeration value="forceunit" />
        <xs:enumeration value="frequencyunit" />
        <xs:enumeration value="illuminanceunit" />
        <xs:enumeration value="inductanceunit" />
        <xs:enumeration value="lengthunit" />
        <xs:enumeration value="luminousfluxunit" />
        <xs:enumeration value="luminousintensityunit" />
        <xs:enumeration value="magneticfluxdensityunit" />
        <xs:enumeration value="magneticfluxunit" />
        <xs:enumeration value="massunit" />
        <xs:enumeration value="planeangleunit" />
        <xs:enumeration value="powerunit" />
        <xs:enumeration value="pressureunit" />
        <xs:enumeration value="radioactivityunit" />
        <xs:enumeration value="solidangleunit" />
        <xs:enumeration value="thermodynamictemperatureunit" />
        <xs:enumeration value="timeunit" />
        <xs:enumeration value="volumeunit" />
        <xs:enumeration value="userdefined" />
    </xs:restriction>
</xs:simpleType>

• IfcUnitEnum
• ifc:UnitType
• ifc:UnitType
• ifc:IfcUnitEnum