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<h3 class="std">4.6.1 Aggregation</h3>
<p>Aggregation indicates an unordered part composition relationship.</p>


<p>Aggregation is used on building elements to indicate parts such as studs within a wall.</p>


<p>Aggregation is used on systems to indicate subsystems such as branch circuits.</p>
                <p>Figure 16 illustrates an instance diagram.</p>
<table><tr><td><img alt="Aggregation" src="diagrams/aggregation.png" usemap="#f16"><map name="f16"><area shape="rect" coords="8,8,176,152" href="../ifckernel/lexical/ifcobjectdefinition.html" alt="IfcObjectDefinition" /><area shape="rect" coords="208,8,376,92" href="../ifckernel/lexical/ifcrelaggregates.html" alt="IfcRelAggregates" /><area shape="rect" coords="408,8,576,212" href="../ifckernel/lexical/ifcobject.html" alt="IfcObject" /></map></td></tr><tr><td><p class="figure">Figure 16 &mdash; Aggregation</p></td></tr></table>

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