Natural language names
frRéférence à une adresse Web
Change log
IFC2x3 to IFC4
Semantic definitions at the type
Type definition

The IfcURIReference provides for identifying a Uniform Resource Identifier (URI). A URI can be classified as a locator or a name or both, that is it may comprise a Uniform Resource Locator (URL) and/or a Uniform Resource Name (URN).

NOTE  See RFC 3986 for definition of Uniform Resource Identifier.
HISTORY  New defined datatype in IFC4.
Formal representations
XSD Specification
 <xs:simpleType name="IfcURIReference">
  <xs:restriction base="xs:normalizedString"/>
 <xs:element name="IfcURIReference-wrapper" nillable="true">
    <xs:extension base="ifc:IfcURIReference">
     <xs:attributeGroup ref="ifc:instanceAttributes"/>
EXPRESS Specification
TYPE IfcURIReference = STRING;

Link to EXPRESS-G diagram EXPRESS-G diagram

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