Natural language names
Change log
IFC4 Addendum 1
Semantic definitions at the type
Type definition

The IfcArcIndex describes a single circular arc segment within a poly curve by providing a list on indices. The first index is the start point of the circular arc, the second index is a point on arc, the third index is the end point of the circular arc. The three points shall not be co-linear.

NOTE  The type is used for IfcIndexedPolyCurve to point into an IfcCartesianPointList for providing the Cartesian points of the circular arc segments of the poly curve.
HISTORY  New Type in IFC4 ADD1
Formal representations
XSD Specification
 <xs:complexType name="IfcArcIndex">
   <xs:extension base="ifc:List-IfcArcIndex">
    <xs:attribute ref="ifc:itemType" fixed="ifc:IfcPositiveInteger"/>
    <xs:attribute ref="ifc:cType" fixed="list"/>
    <xs:attribute ref="ifc:arraySize" use="optional"/>
 <xs:simpleType name="List-IfcArcIndex">
    <xs:list itemType="ifc:IfcPositiveInteger"/>
   <xs:minLength value="3"/>
   <xs:maxLength value="3"/>
 <xs:element name="IfcArcIndex-wrapper" nillable="true">
    <xs:extension base="ifc:IfcArcIndex">
     <xs:attributeGroup ref="ifc:instanceAttributes"/>
EXPRESS Specification
TYPE IfcArcIndex = LIST [3:3] OF IfcPositiveInteger;

Link to EXPRESS-G diagram EXPRESS-G diagram

Link to this page  Link to this page