<xs:simpleType name="IfcSIUnitName">
    <xs:restriction base="xs:string">
        <xs:enumeration value="ampere" />
        <xs:enumeration value="becquerel" />
        <xs:enumeration value="candela" />
        <xs:enumeration value="coulomb" />
        <xs:enumeration value="cubic_metre" />
        <xs:enumeration value="degree_celsius" />
        <xs:enumeration value="farad" />
        <xs:enumeration value="gram" />
        <xs:enumeration value="gray" />
        <xs:enumeration value="henry" />
        <xs:enumeration value="hertz" />
        <xs:enumeration value="joule" />
        <xs:enumeration value="kelvin" />
        <xs:enumeration value="lumen" />
        <xs:enumeration value="lux" />
        <xs:enumeration value="metre" />
        <xs:enumeration value="mole" />
        <xs:enumeration value="newton" />
        <xs:enumeration value="ohm" />
        <xs:enumeration value="pascal" />
        <xs:enumeration value="radian" />
        <xs:enumeration value="second" />
        <xs:enumeration value="siemens" />
        <xs:enumeration value="sievert" />
        <xs:enumeration value="square_metre" />
        <xs:enumeration value="steradian" />
        <xs:enumeration value="tesla" />
        <xs:enumeration value="volt" />
        <xs:enumeration value="watt" />
        <xs:enumeration value="weber" />
    </xs:restriction>
</xs:simpleType>

• IfcSIUnitName
• ifc:Name
• ifc:IfcSIUnitName