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<h4 class="std">4.5.1.3 Spatial Composition</h4>
<p>Provision of a spatial structure of the project by aggregating spatial structure elements. The spatial structure is a hierarchical tree of spatial structure elements (site, building, storey, space) ultimately assigned to the project. Composition refers to the relationship to a higher level element (e.g. this storey is part of a building).</p>
<p>The order of spatial structure elements being included in the concept are from high to low level: <a href="../ifckernel/lexical/ifcproject.htm">IfcProject</a>, <a href="../ifcproductextension/lexical/ifcsite.htm">IfcSite</a>, <a href="../ifcproductextension/lexical/ifcbuilding.htm">IfcBuilding</a>, <a href="../ifcproductextension/lexical/ifcbuildingstorey.htm">IfcBuildingStorey</a>, <i>IfcSpace</i>. Therefore an spatial structure element can only be part of an element at the same or higher level.</p><p class="fig-ref">Figure 27 illustrates an instance diagram.</p>
<table><tr><td><img alt="Spatial Composition" src="./diagrams/spatial-composition.png" usemap="#f27"><map name="f27"><area shape="rect" coords="8,8,176,236" href="../ifcproductextension/lexical/ifcspatialstructureelement.htm" alt="IfcSpatialStructureElement" /><area shape="rect" coords="208,8,376,92" href="../ifckernel/lexical/ifcrelaggregates.htm" alt="IfcRelAggregates" /><area shape="rect" coords="408,8,576,236" href="../ifcproductextension/lexical/ifcspatialstructureelement.htm" alt="IfcSpatialStructureElement" /></map></td></tr><tr><td><p class="figure">Figure 27 &mdash; Spatial Composition</p></td></tr></table>

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<h4>AISC Model View</h4>
<table class="exchange">
<tr><th>Entity</th><th><a href="../views/aisc-model-view/final-steel-detailing-model.htm"><img width="16" src="../../img/mvd-final-steel-detailing-model.png" title="Final Steel Detailing Model"/></a></th>
</tr><tr><td><a href="../ifcproductextension/lexical/ifcbuilding.htm">IfcBuilding</a></td><td>R<br/>R</td>
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<tr><td><a href="../ifcproductextension/lexical/ifcbuildingstorey.htm">IfcBuildingStorey</a></td><td>R<br/>R</td>
</tr>
<tr><td><a href="../ifcproductextension/lexical/ifcsite.htm">IfcSite</a></td><td>R<br/>R</td>
</tr>
</table>
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