4.5.1.2 Element Decomposition

Provision of an aggregation structure where the element, representing the composite, is decomposed into parts represented by other elements.

The composite then provides, if such concepts are in scope of the Model View Definition, exclusively the following:

• Placement — the common object coordinate system to which the parts are placed relative

By default the following constraints apply to an element being decomposed by Element Decomposition:

• Body Geometry — composite is constructed from the sum of the Body Geometry of the parts;
• the composite shall not have an own Body Geometry, body geometry is provided at the parts;
• the composite shall not have an own Material assignment, material is assigned to the parts.

Figure 26 illustrates an instance diagram.

Figure 26 — Element Decomposition

AISC Model View

Entity
IfcBeam	O O
IfcColumn	O O
IfcMechanicalFastener	O O
IfcMember	O O
IfcStair	O O

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