IfcCoveringType

Natural language names
deBekleidung / Belag - Typ
enCovering Type
frRevêtement type
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4
    IfcCoveringTypeMOVEDSchema changed from IFCPRODUCTEXTENSION to IFCSHAREDBLDGELEMENTS.
      OwnerHistoryMODIFIEDInstantiation changed to OPTIONAL.
      ApplicableOccurrenceMODIFIEDType changed from IfcLabel to IfcIdentifier.
Semantic definitions at the entity
Entity definition

The element type IfcCoveringType defines commonly shared information for occurrences of coverings. The set of shared information may include:

It is used to define an covering specification or covering style (i.e. the specific product information, that is common to all occurrences of that product type). Covering types may be exchanged without being already assigned to occurrences.

The occurrences of the IfcCoveringType are represented by instances of IfcCovering

HISTORY  New entity in IFC2x2.

Informal Propositions:

  1. The material assignment, if provided using the IfcRelAssociatesMaterial relationship, shall not reference IfcMaterialLayerSetUsage or IfcMaterialProfileSetUsage.
Attribute definitions
#AttributeTypeCardinalityDescription G
10PredefinedTypeIfcCoveringTypeEnum Predefined types to define the particular type of the covering. There may be property set definitions available for each predefined type.X
Formal Propositions
RuleDescription
CorrectPredefinedTypeThe inherited attribute ElementType shall be provided, if the PredefinedType is set to USERDEFINED.
Inherited definitions from supertypes
Entity inheritance IfcBuildingElementType IfcElementType IfcTypeProduct IfcTypeObject IfcObjectDefinition IfcRoot
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRoot
1GlobalIdIfcGloballyUniqueId Assignment of a globally unique identifier within the entire software world. X
2OwnerHistoryIfcOwnerHistory? Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,
NOTE  only the last modification in stored - either as addition, deletion or modification.
IFC4 CHANGE  The attribute has been changed to be OPTIONAL.
X
3NameIfcLabel? Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule. X
4DescriptionIfcText? Optional description, provided for exchanging informative comments.X
IfcObjectDefinition
HasAssignmentsIfcRelAssigns
@RelatedObjects
S[0:?]Reference to the relationship objects, that assign (by an association relationship) other subtypes of IfcObject to this object instance. Examples are the association to products, processes, controls, resources or groups.X
NestsIfcRelNests
@RelatedObjects
S[0:1]References to the decomposition relationship being a nesting. It determines that this object definition is a part within an ordered whole/part decomposition relationship. An object occurrence or type can only be part of a single decomposition (to allow hierarchical strutures only).
IFC4 CHANGE  The inverse attribute datatype has been added and separated from Decomposes defined at IfcObjectDefinition.
X
IsNestedByIfcRelNests
@RelatingObject
S[0:?]References to the decomposition relationship being a nesting. It determines that this object definition is the whole within an ordered whole/part decomposition relationship. An object or object type can be nested by several other objects (occurrences or types).
IFC4 CHANGE  The inverse attribute datatype has been added and separated from IsDecomposedBy defined at IfcObjectDefinition.
X
HasContextIfcRelDeclares
@RelatedDefinitions
S[0:1]References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object.
IFC4 CHANGE  The inverse attribute datatype has been added.
X
IsDecomposedByIfcRelAggregates
@RelatingObject
S[0:?]References to the decomposition relationship being an aggregation. It determines that this object definition is whole within an unordered whole/part decomposition relationship. An object definitions can be aggregated by several other objects (occurrences or parts).
IFC4 CHANGE  The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.
X
DecomposesIfcRelAggregates
@RelatedObjects
S[0:1]References to the decomposition relationship being an aggregation. It determines that this object definition is a part within an unordered whole/part decomposition relationship. An object definitions can only be part of a single decomposition (to allow hierarchical strutures only).
IFC4 CHANGE  The inverse attribute datatype has been changed from the supertype IfcRelDecomposes to subtype IfcRelAggregates.
X
HasAssociationsIfcRelAssociates
@RelatedObjects
S[0:?]Reference to the relationship objects, that associates external references or other resource definitions to the object.. Examples are the association to library, documentation or classification.X
IfcTypeObject
5ApplicableOccurrenceIfcIdentifier? 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 uppercase
  • 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'.
X
6HasPropertySetsIfcPropertySetDefinition? S[1:?] 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.
X
TypesIfcRelDefinesByType
@RelatingType
S[0:1]Reference to the relationship IfcRelDefinedByType and thus to those occurrence objects, which are defined by this type.X
IfcTypeProduct
7RepresentationMapsIfcRepresentationMap? L[1:?] List of unique representation maps. Each representation map describes a block definition of the shape of the product style. By providing more than one representation map, a multi-view block definition can be given.X
8TagIfcLabel? The tag (or label) identifier at the particular type of a product, e.g. the article number (like the EAN). It is the identifier at the specific level.X
ReferencedByIfcRelAssignsToProduct
@RelatingProduct
S[0:?]Reference to the IfcRelAssignsToProduct relationship, by which other products, processes, controls, resources or actors (as subtypes of IfcObjectDefinition) can be related to this product type.
IFC4 CHANGE  New inverse relationship.
X
IfcElementType
9ElementTypeIfcLabel? The type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes. In particular it holds the user defined type, if the enumeration of the attribute 'PredefinedType' is set to USERDEFINED. X
IfcBuildingElementType
IfcCoveringType
10PredefinedTypeIfcCoveringTypeEnum Predefined types to define the particular type of the covering. There may be property set definitions available for each predefined type.X
Definitions applying to General Usage

 Instance diagram


Concept usage

Material Layer Set

The Material Layer Set concept applies to this entity.

The material of the IfcCoveringType is defined by IfcMaterialLayerSet for layer-based coverings or as fall back by IfcMaterial and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship.



Material Profile Set

The Material Profile Set concept applies to this entity.

The material of the IfcCoveringType is defined by IfcMaterialProfileSet for profile-based coverings or as fall back by IfcMaterial and attached by the IfcRelAssociatesMaterial.RelatingMaterial. It is accessible by the inverse HasAssociations relationship.



Body Geometry

The Type Body Geometry concept applies to this entity.

The IfcCoveringType may define the shared geometric representation for all covering occurrences. The RepresentationMaps attribute refers to a list of IfcRepresentationMap's, that allow for multiple geometric representations (e.g. with IfcShaperepresentation's having an RepresentationIdentifier 'Box', 'Surface', or 'Body'). (See geometric use definition of IfcCovering for further information).

NOTE  If the IfcCoveringType has an associated IfcMaterialLayerSet, then no shared geometric representation shall be provided.
NOTE  The product shape representations are defined as RepresentationMaps (attribute of the supertype IfcTypeProduct), which get assigned by an element occurrence instance through the IfcShapeRepresentation.Item[n] being an IfcMappedItem. See IfcTypeProduct for further information.
NOTE  The values of attributes RepresentationIdentifier and RepresentationType of IfcShapeRepresentation are restricted in the same way as those for IfcCoveringType.


mvdXML Specification
<?xml version="1.0"?>
<ConceptRoot xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" uuid="6b832bc3-4e0a-4d0d-922a-0d428a512feb" name="IfcCoveringType" status="sample" applicableRootEntity="IfcCoveringType">
  <Concepts>
    <Concept uuid="c8cecadd-853e-44d9-83c6-547da56b4ee9" name="Material Layer Set" status="sample" override="false">
      <Template ref="dfb5b3a9-50e3-46e2-8518-1f03e7cfd886" />
    </Concept>
    <Concept uuid="5250a89b-4dfe-4539-9b8c-fdd7a3436e4c" name="Material Profile Set" status="sample" override="false">
      <Template ref="427ac055-2a71-42c2-a423-71689fa75c59" />
    </Concept>
    <Concept uuid="b157ca7a-ee98-4312-b311-8edf208e9060" name="Body Geometry" status="sample" override="false">
      <Template ref="3aec2d00-b4bb-476a-a821-fc22b895b531" />
    </Concept>
  </Concepts>
</ConceptRoot>
Concept inheritance

#ConceptTemplateModel View
IfcRoot
IdentitySoftware IdentityGeneral Usage
Revision ControlRevision ControlGeneral Usage
IfcTypeProduct
Product Type ShapeProduct Type ShapeGeneral Usage
IfcCoveringType
Material Layer SetMaterial Layer SetGeneral Usage
Material Profile SetMaterial Profile SetGeneral Usage
Body GeometryType Body GeometryGeneral Usage
Formal representations
XML Specification
 <xs:element name="IfcCoveringType" type="ifc:IfcCoveringType" substitutionGroup="ifc:IfcBuildingElementType" nillable="true"/>
 <xs:complexType name="IfcCoveringType">
  <xs:complexContent>
   <xs:extension base="ifc:IfcBuildingElementType">
    <xs:attribute name="PredefinedType" type="ifc:IfcCoveringTypeEnum" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcCoveringType
 SUBTYPE OF (IfcBuildingElementType);
  PredefinedType : IfcCoveringTypeEnum;
 WHERE
  CorrectPredefinedType : (PredefinedType <> IfcCoveringTypeEnum.USERDEFINED) OR
((PredefinedType = IfcCoveringTypeEnum.USERDEFINED) AND EXISTS(SELF\IfcElementType.ElementType));
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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