|Définition d'un type d'objet type|
|Objekt (allgemein) - Typ|
The object type defines the
specific information about a type, being common to all
occurrences of this type. It refers to the specific level of the
well recognized generic - specific - occurrance modeling
paradigm. The IfcTypeObject gets assigned to the
individual object instances (the occurrences) via the
NOTE The terms 'Type' and 'Style' are often
The object type is represented by a set of property set
definitions. The attached property sets describe the available
alpha-numeric information about the object type. and are used to
define all common properties that apply to all object occurrences
of that type.
NOTE If a property having having the same name
is used within the IfcPropertySet assigned to an
IfcTypeObject (and subtypes) and to an occurrence of that
type, then the occurrence property overrides the type property.
See IfcRelDefinesByType for an explanatory
Object types may be exchanged without being already assigned
to objects. An object type may have an indication of the library
(or catalogue) from which its definition originates. This
association is handled by the inherited HasAssociations
relationship pointing to IfcRelAssociatesLibrary.
HISTORY New entity in IFC2x
IFC2x3 CHANGE The IfcTypeObject is now subtyped from the new supertype IfcObjectDefinition, and the attribute HasPropertySets has been changed from a LIST into a SET.
IFC4 CHANGE (1) The entity IfcTypeObject shall not be instantiated from IFC4 onwards. It will be changed into an ABSTRACT supertype in future releases of IFC. (2) The inverse attribute Types has been renamed from ObjectTypeOf.
XSD Specification: <xs:element name="IfcTypeObject" type="ifc:IfcTypeObject" substitutionGroup="ifc:IfcObjectDefinition" nillable="true"/>
<xs:element name="HasPropertySets" nillable="true" minOccurs="0">
<xs:element ref="ifc:IfcPropertySetDefinition" maxOccurs="unbounded"/>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcPropertySetDefinition"/>
<xs:attribute ref="ifc:cType" fixed="set"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
<xs:attribute name="ApplicableOccurrence" type="ifc:IfcIdentifier" use="optional"/>
|WR1|| : ||EXISTS(SELF\IfcRoot.Name);|
|ApplicableOccurrence|| : ||
The attribute optionally defines the data type of the occurrence object, to which the assigned type object can relate. If not present, no instruction is given to which occurrence object the type object is applicable. The following conventions are used:
- The IFC entity name of the applicable occurrence using the IFC naming convention, CamelCase with IFC prefix
- It can be optionally followed by the predefined type after the separator "/" (forward slash), using Uupper case
- If one type object is applicable to many occurrence objects, then those occurrence object names should be separate by comma "," forming a comma separated string.
EXAMPLE Refering to a furniture as applicable occurrence entity would be expressed as 'IfcFurnishingElement', refering to a brace as applicable entity would be expressed as 'IfcMember/BRACE', refering to a wall and wall standard case would be expressed as 'IfcWall, IfcWallStandardCase'.
|HasPropertySets|| : ||
Set |list of unique property sets, that are associated with the object type and are common to all object occurrences referring to this object type.
IFC2x3 CHANGE The attribute aggregate type has been changed from LIST to SET.
|Types|| : ||Reference to the relationship IfcRelDefinedByType and thus to those occurrence objects, which are defined by this type.|
|WR1|| : ||A Name attribute has to be provided. The name can be declared within the IFC specification as part of the property set agreements. |
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