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<h5 class="std">4.10.2.1.2 Axis 3D Geometry</h5>
<p>
The 'Axis' representation using 'Curve3D' representation type is predominately used to align material profile sets to geometric representations of standard beams, columns, members, pipes, ducts and other longitudinal elements.

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<p>The following attribute values for the
 <a href="../ifcrepresentationresource/lexical/ifcshaperepresentation.htm">IfcShapeRepresentation</a> holding this geometric
 representation shall be used:</p>

<ul>
 
<li><a href="../ifcrepresentationresource/lexical/ifcshaperepresentation.htm">IfcShapeRepresentation</a><i>.RepresentationIdentifier</i> =
'Axis'</li>


 <li><a href="../ifcrepresentationresource/lexical/ifcshaperepresentation.htm">IfcShapeRepresentation</a><i>.RepresentationType</i> : 'Curve3D'</li>
 
<li><a href="../ifcrepresentationresource/lexical/ifcshaperepresentation.htm">IfcShapeRepresentation</a><i>.Items</i> =
 <a href="../ifcgeometryresource/lexical/ifcboundedcurve.htm">IfcBoundedCurve</a></li>

</ul>
<p>Figure 40 illustrates an instance diagram.</p>
<table><tr><td><img alt="Axis 3D Geometry" src="diagrams/axis-3d-geometry.png" usemap="#f40"><map name="f40"><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/ifcboundedcurve.htm" alt="IfcBoundedCurve"></map></td></tr><tr><td><p class="figure">Figure 40 &mdash; Axis 3D Geometry</p></td></tr></table>

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