Definition from IAI: The element type
(IfcTransportElementType) defines a list of commonly shared property set
definitions of an element and an optional set of product representations. It is
used to define an element specification (i.e. the specific product information,
that is common to all occurences of that product type).
NOTE: The product representations are defined as
representation maps (at the level of the supertype IfcTypeProduct, which
gets assigned by an element occurrence instance through the
IfcShapeRepresentation.Item[1] being an
IfcMappedItem.
A transport element type is used to define the common properties of a
certain type of a transport element that may be applied to many instances of
that type to assign a specific style. Transport element types (or the
instantiable subtypes) may be exchanged without being already assigned to
occurrences.
The occurrences of the IfcTransportElementType are represented by
instances of IfcTransportElement (or its subtypes).
HISTORY: New entity in Release IFC2x
Edition 2.
