IfcDimensionCount

Semantic definitions at the type

Type definition

The IfcDimensionCount defins the dimensionality of the coordinate space. It is restricted to have the dimensionality of either 1, 2, or 3 for the purpose of this specification.

NOTE The shape representations assigned to a geometric representation context may include geometric representation items of lower dimensionality, particularly when defining the boundary of planar surfaces as 2D cross sections for the purpose of 3D swept areas.

NOTE Definition according to ISO/CD 10303-42:1992
A dimension count is a positive integer used to define the coordinate space dimensionality.

NOTE Type adapted from dimension_count defined in ISO 10303-42.

HISTORY New Type in IFC1.5

Rule	Description
WR1	The dimension count should be an integer between 1 and 3 NOTE: This is a further constraint by IFC, the upper limit does not exist in STEP.

Formal representations

XSD Specification

 <xs:simpleType name="IfcDimensionCount">

  <xs:restriction base="xs:long"/>

 </xs:simpleType>

 <xs:element name="IfcDimensionCount-wrapper" nillable="true">

  <xs:complexType>

   <xs:simpleContent>

    <xs:extension base="ifc:IfcDimensionCount">

     <xs:attributeGroup ref="ifc:instanceAttributes"/>

    </xs:extension>

   </xs:simpleContent>

  </xs:complexType>

 </xs:element>

EXPRESS Specification


TYPE IfcDimensionCount = INTEGER;
 WHERE

  WR1 : { 0 < SELF <= 3 }
END_TYPE;


 EXPRESS-G diagram

	Dimension Count
	Dimensionalité