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<h4 class="std">4.10.2.3 Surface Geometry</h4>
<p>
Elements may have a 'Surface' representation describing the
 outer surface of the object. Such representation may be
 used for hit-testing objects having part composition such
 as framed walls.

</p>
      <p>Figure 44 illustrates an instance diagram.</p>
<table><tr><td><img alt="Surface Geometry" src="diagrams/surface-geometry.png" usemap="#f44"><map name="f44"><area shape="rect" coords="8,8,176,392" href="../ifcproductextension/lexical/ifcelement.htm" alt="IfcElement"><area shape="rect" coords="208,8,376,80" href="../ifcrepresentationresource/lexical/ifcproductdefinitionshape.htm" alt="IfcProductDefinitionShape"><area shape="rect" coords="408,8,576,116" href="../ifcrepresentationresource/lexical/ifcshaperepresentation.htm" alt="IfcShapeRepresentation"><area shape="rect" coords="608,8,776,116" href="../ifcrepresentationresource/lexical/ifcgeometricrepresentationcontext.htm" alt="IfcGeometricRepresentationContext"><area shape="rect" coords="608,128,776,140" href="../ifcmeasureresource/lexical/ifclabel.htm" alt="IfcLabel"><area shape="rect" coords="608,152,776,164" href="../ifcmeasureresource/lexical/ifclabel.htm" alt="IfcLabel"><area shape="rect" coords="608,176,776,212" href="../ifcgeometryresource/lexical/ifcboundedsurface.htm" alt="IfcBoundedSurface"><area shape="rect" coords="808,8,976,80" href="../ifcpresentationappearanceresource/lexical/ifcstyleditem.htm" alt="IfcStyledItem"><area shape="rect" coords="1008,8,1176,56" href="../ifcpresentationappearanceresource/lexical/ifcsurfacestyle.htm" alt="IfcSurfaceStyle"></map></td></tr><tr><td><p class="figure">Figure 44 &mdash; Surface Geometry</p></td></tr></table>

<hr>
<h4>Electrical System Design</h4>
<p>This concept is used by entities for exchanges as shown.</p>
<table class="exchange">
<tr><td></td><td><a href="../views/electrical-system-design/facility-criteria.htm"><image width="16" src="../../img/mvd-facility-criteria.png" title="Facility Criteria"></image></a></td>
<td><a href="../views/electrical-system-design/discipline-specifications.htm"><image width="16" src="../../img/mvd-discipline-specifications.png" title="Discipline Specifications"></image></a></td>
<td><a href="../views/electrical-system-design/project-definition.htm"><image width="16" src="../../img/mvd-project-definition.png" title="Project Definition"></image></a></td>
<td><a href="../views/electrical-system-design/space-program.htm"><image width="16" src="../../img/mvd-space-program.png" title="Space Program"></image></a></td>
<td><a href="../views/electrical-system-design/product-program.htm"><image width="16" src="../../img/mvd-product-program.png" title="Product Program"></image></a></td>
<td><a href="../views/electrical-system-design/design-early.htm"><image width="16" src="../../img/mvd-design-early.png" title="Design Early"></image></a></td>
<td><a href="../views/electrical-system-design/system-layout.htm"><image width="16" src="../../img/mvd-system-layout.png" title="System Layout"></image></a></td>
<td><a href="../views/electrical-system-design/design-schematic.htm"><image width="16" src="../../img/mvd-design-schematic.png" title="Design Schematic"></image></a></td>
<td><a href="../views/electrical-system-design/product-type-template.htm"><image width="16" src="../../img/mvd-product-type-template.png" title="Product Type Template"></image></a></td>
<td><a href="../views/electrical-system-design/product-template.htm"><image width="16" src="../../img/mvd-product-template.png" title="Product Template"></image></a></td>
<td><a href="../views/electrical-system-design/product-type-selection.htm"><image width="16" src="../../img/mvd-product-type-selection.png" title="Product Type Selection"></image></a></td>
<td><a href="../views/electrical-system-design/system-operation.htm"><image width="16" src="../../img/mvd-system-operation.png" title="System Operation"></image></a></td>
<td><a href="../views/electrical-system-design/design-coordinated.htm"><image width="16" src="../../img/mvd-design-coordinated.png" title="Design Coordinated"></image></a></td>
</tr><tr><td><a href="../ifcsharedbldgelements/lexical/ifcslabelementedcase.htm">IfcSlabElementedCase</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>R</td>
</tr>
<tr><td><a href="../ifcsharedbldgelements/lexical/ifcwallelementedcase.htm">IfcWallElementedCase</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>R</td>
</tr>
</table>
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