IfcProductDefinitionShape

Semantic definitions at the entity

Entity definition

The IfcProductDefinitionShape defines all shape relevant information about an IfcProduct. It allows for multiple geometric shape representations of the same product. The shape relevant information includes:

the shape representation including geometric representation items (for 3D solids, 2D annotations, etc.) and:
- associated presentation information (line color, line type, surface rendering properties)
- assignment to presentation layers (CAD layers for visibility control)
or the topological representation items for connectivity systems (vertex, edge, face representations) that may include geometric representation items (vertex points, edge curves, face surfaces)

NOTE The definition of this entity relates to the ISO 10303 entity product_definition_shape. Please refer to ISO/IS 10303-41:1994 for the final definition of the formal standard.

HISTORY New entity in IFC1.5

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
	ShapeOfProduct	IfcProduct @Representation	S[1:?]	The IfcProductDefinitionShape shall be used to provide a representation for a single instance of IfcProduct.	X
	HasShapeAspects	IfcShapeAspect @PartOfProductDefinitionShape	S[0:?]	Reference to the shape aspect that represents part of the shape or its feature distinctively.	X

Formal Propositions

Rule	Description
OnlyShapeModel	Only representations of type IfcShapeModel, i.e. either IfcShapeRepresentation or IfcTopologyRepresentation should be used to represent a product through the IfcProductDefinitionShape.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcProductRepresentation
1	Name	IfcLabel	[0:1]	The word or group of words by which the product representation is known.	X
2	Description	IfcText	[0:1]	The word or group of words that characterize the product representation. It can be used to add additional meaning to the name of the product representation.	X
3	Representations	IfcRepresentation	L[1:?]	Contained list of representations (including shape representations). Each member defines a valid representation of a particular type within a particular representation context.	X
IfcProductDefinitionShape
	ShapeOfProduct	IfcProduct @Representation	S[1:?]	The IfcProductDefinitionShape shall be used to provide a representation for a single instance of IfcProduct.	X
	HasShapeAspects	IfcShapeAspect @PartOfProductDefinitionShape	S[0:?]	Reference to the shape aspect that represents part of the shape or its feature distinctively.	X

Formal representations

XSD Specification

 <xs:element name="IfcProductDefinitionShape" type="ifc:IfcProductDefinitionShape" substitutionGroup="ifc:IfcProductRepresentation" nillable="true"/>

 <xs:complexType name="IfcProductDefinitionShape">

  <xs:complexContent>

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

    <xs:sequence>

     <xs:element name="HasShapeAspects" nillable="true" minOccurs="0">

      <xs:complexType>

       <xs:sequence>

        <xs:element ref="ifc:IfcShapeAspect" minOccurs="0" maxOccurs="unbounded"/>

       </xs:sequence>

       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcShapeAspect"/>

       <xs:attribute ref="ifc:cType" fixed="set"/>

       <xs:attribute ref="ifc:arraySize" use="optional"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcProductDefinitionShape

 SUBTYPE OF (IfcProductRepresentation);

 INVERSE

  ShapeOfProduct : SET [1:?] OF IfcProduct FOR Representation;

  HasShapeAspects : SET OF IfcShapeAspect FOR PartOfProductDefinitionShape;

 WHERE

  OnlyShapeModel : SIZEOF(QUERY(temp <* Representations | 
  (NOT('IFCREPRESENTATIONRESOURCE.IFCSHAPEMODEL' IN TYPEOF(temp)))
)) = 0;
END_ENTITY;

 EXPRESS-G diagram

	Produkt - Repräsentation der Form
	Product Definition Shape
	Représentation de la forme du produit