The IfcColour is a select between different definitions of colour used for presentation styles.
NOTE Definition according to ISO/CD 10303-46:1992
The colour entity defines a basic appearance of elements which shall be visualized in a picture.
NOTE Type adapted from colour defined in ISO10303-46.
HISTORY New select type in IFC2x2.
TYPE IfcColour = SELECT (IfcColourSpecification ,IfcPreDefinedColour); END_TYPE;