ifc:IfcBuildingSystemTypeEnum

<xs:simpleType name="IfcBuildingSystemTypeEnum">
  <xs:restriction base="xs:string">
    <xs:enumeration value="fenestration"/>
    <xs:enumeration value="foundation"/>
    <xs:enumeration value="loadbearing"/>
    <xs:enumeration value="outershell"/>
    <xs:enumeration value="shading"/>
    <xs:enumeration value="transport"/>
    <xs:enumeration value="userdefined"/>
    <xs:enumeration value="notdefined"/>
  </xs:restriction>
</xs:simpleType>