The style assignment select is a selection of two wasy of assigning presentation styles to an IfcStyledItem.

HISTORY  New select type in IFC4.
IFC4 CHANGE  The select type has been introduced to provide an upward compatible improvement for assigning styles to a styled items.
DEPRECATION  Using IfcPresentationStyleAssignment is deprecated, use the direct assignment of a subtype of IfcPresentationStyle instead.

XSD Specification:

 <xs:group name="IfcStyleAssignmentSelect">
   <xs:element ref="ifc:IfcPresentationStyle"/>
   <xs:element ref="ifc:IfcPresentationStyleAssignment"/>

EXPRESS Specification:

TYPE IfcStyleAssignmentSelect = SELECT (

Link to EXPRESS-G diagram EXPRESS-G diagram

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