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<h3 class="std">4.2.2 Project Units</h3>
  <p class="std">

        The project context includes the definition of the default units within the IFC data set. Default units are

        those units that apply:

      </p>

      <ul class="std">

        <li class="std">to all geometric representation items within the geometric representation contexts;

        </li>

        <li class="std">to all attributes with a defined datatype indicating a measure datatype;

        </li>

        <li class="std">to all properties and quantities with a defined datatype indicating a measure datatype and with

        no local unit definitions provided.

        </li>

      </ul>
<p>Figure 4 illustrates an instance diagram.</p>
<table><tr><td><img alt="Project Units" src="diagrams/project-units.png" usemap="#f4"><map name="f4"><area shape="rect" coords="8,8,176,236" href="../ifckernel/lexical/ifccontext.html" alt="IfcContext" /><area shape="rect" coords="208,8,376,32" href="../ifcmeasureresource/lexical/ifcunitassignment.html" alt="IfcUnitAssignment" /></map></td></tr><tr><td><p class="figure">Figure 4 &mdash; Project Units</p></td></tr></table>

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