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<h4 class="std">4.4.2.1 Properties for Occurrences</h4>
<p>Any specialization of <i>object</i> can be related to multiple <i>property set occurrences</i>. 
A property set
 contains multiple <i>property occurrences</i>. The data types of property occurrences are single value, enumerated value,
 bounded value, table value, reference value, list value,
 and combination of property occurrences.</p>
                <p>Figure 12 illustrates an instance diagram.</p>
<table><tr><td><img alt="Properties for Occurrences" src="diagrams/properties-for-occurrences.png" usemap="#f12"><map name="f12"><area shape="rect" coords="8,8,176,212" href="../ifckernel/lexical/ifcobject.htm" alt="IfcObject"><area shape="rect" coords="208,8,376,92" href="../ifckernel/lexical/ifcreldefinesbyproperties.htm" alt="IfcRelDefinesByProperties"><area shape="rect" coords="408,8,576,140" href="../ifckernel/lexical/ifcpropertyset.htm" alt="IfcPropertySet"><area shape="rect" coords="608,8,776,104" href="../ifcpropertyresource/lexical/ifcproperty.htm" alt="IfcProperty"></map></td></tr><tr><td><p class="figure">Figure 12 &mdash; Properties for Occurrences</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="../ifckernel/lexical/ifcactor.htm">IfcActor</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>-</td>
</tr>
<tr><td><a href="../ifcproductextension/lexical/ifcbuilding.htm">IfcBuilding</a></td><td>-<br>O</td>
<td>-<br>O</td>
<td>-<br>-</td>
<td>R<br>R</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>
</tr>
<tr><td><a href="../ifcproductextension/lexical/ifcbuildingstorey.htm">IfcBuildingStorey</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</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="../ifcelectricaldomain/lexical/ifccablecarrierfitting.htm">IfcCableCarrierFitting</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>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifccablecarriersegment.htm">IfcCableCarrierSegment</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifccablefitting.htm">IfcCableFitting</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifccablesegment.htm">IfcCableSegment</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifchvacdomain/lexical/ifcchiller.htm">IfcChiller</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcsharedbldgserviceelements/lexical/ifcdistributioncircuit.htm">IfcDistributionCircuit</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>-</td>
</tr>
<tr><td><a href="../ifcproductextension/lexical/ifcdistributionelement.htm">IfcDistributionElement</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>-</td>
</tr>
<tr><td><a href="../ifcsharedbldgserviceelements/lexical/ifcdistributionport.htm">IfcDistributionPort</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>R</td>
<td>-<br>R</td>
<td>-<br>R</td>
<td>-<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>R</td>
<td>-<br>R</td>
<td>-<br>R</td>
</tr>
<tr><td><a href="../ifcsharedbldgserviceelements/lexical/ifcdistributionsystem.htm">IfcDistributionSystem</a></td><td>-<br>-</td>
<td>-<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifcelectricappliance.htm">IfcElectricAppliance</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifcelectricdistributionboard.htm">IfcElectricDistributionBoard</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>R</td>
<td>-<br>-</td>
<td>-<br>R</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifcelectricflowstoragedevice.htm">IfcElectricFlowStorageDevice</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifcelectricgenerator.htm">IfcElectricGenerator</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifcelectricmotor.htm">IfcElectricMotor</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifchvacdomain/lexical/ifcflowmeter.htm">IfcFlowMeter</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifcjunctionbox.htm">IfcJunctionBox</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifclamp.htm">IfcLamp</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>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifclightfixture.htm">IfcLightFixture</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcsharedfacilitieselements/lexical/ifcoccupant.htm">IfcOccupant</a></td><td>-<br>R</td>
<td>-<br>R</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>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifcoutlet.htm">IfcOutlet</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifcprotectivedevice.htm">IfcProtectiveDevice</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifchvacdomain/lexical/ifcpump.htm">IfcPump</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>R</td>
<td>R<br>R</td>
<td>-<br>R</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifcsolardevice.htm">IfcSolarDevice</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcproductextension/lexical/ifcspace.htm">IfcSpace</a></td><td>-<br>-</td>
<td>-<br>O</td>
<td>-<br>-</td>
<td>-<br>R</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>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifcswitchingdevice.htm">IfcSwitchingDevice</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcelectricaldomain/lexical/ifctransformer.htm">IfcTransformer</a></td><td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifcproductextension/lexical/ifctransportelement.htm">IfcTransportElement</a></td><td>-<br>-</td>
<td>-<br>R</td>
<td>-<br>-</td>
<td>-<br>R</td>
<td>R<br>R</td>
<td>-<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>R<br>R</td>
</tr>
<tr><td><a href="../ifchvacdomain/lexical/ifcunitaryequipment.htm">IfcUnitaryEquipment</a></td><td>-<br>-</td>
<td>-<br>O</td>
<td>-<br>-</td>
<td>-<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>R<br>R</td>
<td>R<br>R</td>
<td>-<br>-</td>
<td>-<br>-</td>
<td>-<br>R</td>
<td>-<br>-</td>
<td>-<br>R</td>
</tr>
</table>
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