Enable multiple mapped items as a shape representation of regular patterns

Based on          IFC2x3

Initiator            ISG Meeting-Budapest

Effects              Coordination View 2.0

Date                    2011 10 24


Elements having pattern like arrangement of components, such as a bolt / nail group, a group of reinforcement bars, etc. are best defined in terms of their geometry as multiple mapped items referring to the same representation map.

This implementer agreement makes a preference to export such multiple mapped items and requires the correct import of multiple mapped items. In addition it provides a guideline to implement it.

The following figure shows how multiple mapped items shall be implemented as the 'Body' shape representation of such elements, as e.g. an IfcFastener.



Figure 1: Use of multiple mapped items as a shape representation for elements.

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