Definition from ISO/CD 10303-43:1992: A mapped item is the use of
an existing representation (the mapping source - mapped representation) as a
representation item in a second representation.
NOTE: A mapped item is a subtype of representation
item. It enables a representation to be used as a representation item in one or
more other representations. The mapped item allows for the definition of a
representation using other representations.
Definition from IAI: The IfcMappedItem is the inserted
instance of a source definition (to be compared with a block / cell / macro
definition). The instance is inserted by applying a Cartesian transformation
operator as the MappingTarget.
NOTE: Corresponding STEP entity:
mapped_item. Please refer to ISO/IS 10303-43:1994, for the final definition of
the formal standard. The definition of mapping_target (MappingTarget)
has been restricted to be of the type cartesian_transformation_operator
(IfcCartesianTransformationOperator).
HISTORY: New entity in IFC Release 2x.
Informal Propositions
- A mapped item shall not be self-defining by participating in the
definition of the representation being mapped.
- The dimensionality of the mapping source and the mapping target has
to be the same, if the mapping source is a geometric representation item.
