|Ensemble de propriétés|
|frei definierbare Merkmalsliste|
IfcPropertySet defines all dynamically extensible
properties. The property set is a container class that holds
properties within a property tree. These properties are
interpreted according to their name attribute.
The same IfcPropertySet can be assigned to multiple
object occurrences; it should then be assigned by a single
instance of IfcRelDefinedByProperties to a set of
related objects. Those property sets are referred to as
shared property sets. It can also be assigned to an object
An IfcPropertySetTemplate may define the underlying
structure, i.e. the required name, the applicable object or
object types to which the property set can be attached, and
the individual properties that maybe included.
NOTE See IfcRelDefinesByType for how to
override property sets assigned to an object type within the
HISTORY New entity in IFC1.0
IFC4 CHANGE All statically defined property set
entities are no longer subtypes of IfcPropertySet.
Relationship use definition
Property sets are related to other objects by using the
relationship object that refers to the corresponding object:
IfcRelDefinesByProperties using the inverse
Type Object: using a direct link by inverse
IfcRelDefinesByTemplate using the inverse
External reference: subtypes of
IfcRelAssociates are used to provide a link to a
classification system, or external library providing
further reference to the property set. Accessible by
inverse attribute HasAssociations.
Attribute use definition
Instances of IfcPropertySet are used to assign named
sets of individual properties (complex or single properties).
Each individual property has a significant name string. Some
property sets are included in the IFC specification and
have a predefined set of properties indicated by
assigning a significant name. These property sets are listed
under "property sets" main menu item within this
specification and from the object documentation sheet for
those object to which they are applicable. The naming
convention "Pset_Xxx" applies to all those property sets that
are defined as part of the IFC specification and it shall be
used as the value of the Name attribute.
In addition any user defined property set can be captured.
Property sets that are not declared as part of the IFC
specification shall have a Name value not including
the "Pset_" prefix.
XSD Specification: <xs:element name="IfcPropertySet" type="ifc:IfcPropertySet" substitutionGroup="ifc:IfcPropertySetDefinition" nillable="true"/>
<xs:element ref="ifc:IfcProperty" maxOccurs="unbounded"/>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcProperty"/>
<xs:attribute ref="ifc:cType" fixed="set"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
|ExistsName|| : ||EXISTS(SELF\IfcRoot.Name);|
|UniquePropertyNames|| : ||IfcUniquePropertyName(HasProperties);|
|HasProperties|| : ||Contained set of properties. For property sets defined as part of the IFC Object model, the property objects within a property set are defined as part of the standard. If a property is not contained within the set of predefined properties, its value has not been set at this time.
|ExistsName|| : ||
The Name attribute has to be provided. The attribute is used to specify the signifier of the property set. The properties that are allowed to be attached to a particular property set may be given within the property set definition part of the IFC specification. Those property set definitions are references in the semantic definition section of the individal subtypes of IfcObjectDefinition.
|UniquePropertyNames|| : ||
Every individual subtype of IfcProperty within the property set shall have a unique Name attribute value.
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