ifc:IfcStairTypeEnum

<xs:simpleType name="IfcStairTypeEnum">
  <xs:restriction base="xs:string">
    <xs:enumeration value="straight_run_stair"/>
    <xs:enumeration value="two_straight_run_stair"/>
    <xs:enumeration value="quarter_winding_stair"/>
    <xs:enumeration value="quarter_turn_stair"/>
    <xs:enumeration value="half_winding_stair"/>
    <xs:enumeration value="half_turn_stair"/>
    <xs:enumeration value="two_quarter_winding_stair"/>
    <xs:enumeration value="two_quarter_turn_stair"/>
    <xs:enumeration value="three_quarter_winding_stair"/>
    <xs:enumeration value="three_quarter_turn_stair"/>
    <xs:enumeration value="spiral_stair"/>
    <xs:enumeration value="double_return_stair"/>
    <xs:enumeration value="curved_run_stair"/>
    <xs:enumeration value="two_curved_run_stair"/>
    <xs:enumeration value="userdefined"/>
    <xs:enumeration value="notdefined"/>
  </xs:restriction>
</xs:simpleType>