IfcVertexLoop

Natural language names
Vertexschleife - Topologie
Vertex Loop
Boucle de points
Semantic definitions at the entity
Entity definition

NOTE  Definition according to ISO/CD 10303-42:1992
A vertex_loop is a loop of zero genus consisting of a single vertex. A vertex can exist independently of a vertex loop. The topological data shall satisfy the following constraint:

Image

NOTE  Entity adapted from vertex_loop defined in ISO 10303-42.

HISTORY  New entity in IFC2x2.

Informal Propositions:

  1. A vertex loop has zero extent and dimensionality.
  2. The vertex loop has genus 0.
Attribute definitions
#AttributeTypeCardinalityDescription G
1LoopVertexIfcVertex The vertex which defines the entire loop. X
Inherited definitions from supertypes
Entity inheritance IfcLoop IfcTopologicalRepresentationItem IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRepresentationItem
LayerAssignmentIfcPresentationLayerAssignment
@AssignedItems
S[0:1]Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.
IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added.
IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
X
StyledByItemIfcStyledItem
@Item
S[0:1]Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.
IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
X
IfcTopologicalRepresentationItem
IfcLoop
IfcVertexLoop
1LoopVertexIfcVertex The vertex which defines the entire loop. X
Formal representations
XML Specification
 <xs:element name="IfcVertexLoop" type="ifc:IfcVertexLoop" substitutionGroup="ifc:IfcLoop" nillable="true"/>
 <xs:complexType name="IfcVertexLoop">
  <xs:complexContent>
   <xs:extension base="ifc:IfcLoop">
    <xs:sequence>
     <xs:element name="LoopVertex" type="ifc:IfcVertex" nillable="true"/>
    </xs:sequence>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcVertexLoop
 SUBTYPE OF (IfcLoop);
  LoopVertex : IfcVertex;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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