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<h3 class="std">4.4.3 Quantity Sets</h3>

      
      <p class="std">
        Any specialization of <i>object</i> can be related to multiple <i>quantity set occurrences</i>. A quantity set
        contains multiple <i>quantity occurrences</i>. The data type of
        quantity occurrence are count, length, area, volume, weight, time, and combination of quantity occurrences.
      </p>
<p>Figure 12 illustrates an instance diagram.</p>
<table><tr><td><img alt="Quantity Sets" src="diagrams/quantity-sets.png" usemap="#f12"><map name="f12"><area shape="rect" coords="8,8,176,212" href="../ifckernel/lexical/ifcobject.html" alt="IfcObject" /><area shape="rect" coords="208,8,376,92" href="../ifckernel/lexical/ifcreldefinesbyproperties.html" alt="IfcRelDefinesByProperties" /><area shape="rect" coords="408,8,576,152" href="../ifcproductextension/lexical/ifcelementquantity.html" alt="IfcElementQuantity" /></map></td></tr><tr><td><p class="figure">Figure 12 &mdash; Quantity Sets</p></td></tr></table>

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