IfcCompositeProfileDef

BACnet MVD

#### IfcCompositeProfileDef

Natural language names

| Zusammengesetztes Profil
| Composite Profile Def
| Définition de profil composite

##### Semantic definitions at the entity

Entity definition

The IfcCompositeProfileDef defines the profile by composition of other profiles. The composition is given by a set of at least two other profile definitions. Any profile definition (except for another composite profile) can be used to construct the composite.

> HISTORY New entity in IFC2x.

Figure 314 illustrates the composite profile definition. The IfcCompositeProfileDef does not define an own position coordinate system, it is directly defined in the underlying coordinate system. The underlying coordinate system is defined by the swept surface or swept area solid that uses the profile definition. It is the xy plane of either:

- IfcSweptSurface.Position
- IfcSweptAreaSolid.Position

Or in case of sectioned spines it is the xy plane of each list member of IfcSectionedSpine.CrossSectionPositions. The IfcCompositeProfileDef is defined using other profile definitions. Those other profile definitions are directly inserted into the underlying coordinate system.

- In case of parameterized profile definitions, the Position attribute of those standard profiles is used to place the profiles relatively to each other.
- In case of arbitrary profile definitions, each Cartesian coordinate is given directly within the underlying coordinate system.

> NOTE The black coordinate axes show the underlying coordinate system of the swept surface or swept area solid.

Figure 314

Twin profiles special case

If twin profiles are modeled by profile composition, the base profile should only be specified once. It is then included into the composite profile directly and additionally indirectly via IfcMirroredProfileDef. For example, a double angle made of two L100x10 with 10mm air gap between them, i.e. a _| |_ shape, can be modeled as

> `single_L : IfcLShapeProfileDef := IfcLShapeProfileDef(AREA, 'L100X100X10',
> IfcAxis2Placement2D(IfcCartesianPoint(((.100+.010)/2., .0)), ?),
> .100, .100, .010, .012, ?, 0., ?, ?);
> double_L : IfcCompositeProfileDef := IfcCompositeProfileDef(AREA, 'double angle',
> (single_L, IfcMirroredProfileDef(AREA, ?, single_L, ?)), 'twin profile');`

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
3 | Profiles | IfcProfileDef | S[2:?] | The profiles which are used to define the composite profile. | X | X
4 | Label | IfcLabel | ? | The name by which the composition may be referred to. The actual meaning of the name has to be defined in the context of applications. | X | X

Formal Propositions

Rule | Description
--- | ---
InvariantProfileType | Either all profiles are areas or all profiles are curves.
NoRecursion | A composite profile should not include another composite profile, i.e. no recursive definitions should be allowed.

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcProfileDef
1 | ProfileType | IfcProfileTypeEnum |  | Defines the type of geometry into which this profile definition shall be resolved, either a curve or a surface area. In case of curve the profile should be referenced by a swept surface, in case of area the profile should be referenced by a swept area solid. | X | X
2 | ProfileName | IfcLabel | ? | Human-readable name of the profile, for example according to a standard profile table. As noted above, machine-readable standardized profile designations should be provided in IfcExternalReference.ItemReference. | X | X

HasExternalReference

IfcExternalReferenceRelationship
@RelatedResourceObjects

S[0:?]

Reference to external information, e.g. library, classification, or document information, which is associated with the profile.

> IFC4 CHANGE New inverse attribute

X

HasProperties

IfcProfileProperties
@ProfileDefinition

S[0:?]

Additional properties of the profile, for example mechanical properties.

> IFC4 CHANGE New inverse attribute

X

IfcCompositeProfileDef
3 | Profiles | IfcProfileDef | S[2:?] | The profiles which are used to define the composite profile. | X | X
4 | Label | IfcLabel | ? | The name by which the composition may be referred to. The actual meaning of the name has to be defined in the context of applications. | X | X

##### Formal representations

XML Specification
`<xs:element name="IfcCompositeProfileDef" type="ifc:IfcCompositeProfileDef" substitutionGroup="ifc:IfcProfileDef" nillable="true"/>
<xs:complexType name="IfcCompositeProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcProfileDef">
<xs:sequence>
<xs:element name="Profiles">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcProfileDef" minOccurs="2" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcProfileDef"/>
<xs:attribute ref="ifc:cType" fixed="set"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="Label" type="ifc:IfcLabel" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcCompositeProfileDef
SUBTYPE OF (IfcProfileDef);
Profiles : SET [2:?] OF IfcProfileDef;
Label : OPTIONAL IfcLabel;
WHERE
InvariantProfileType : SIZEOF(QUERY(temp <* Profiles | temp.ProfileType <> Profiles[1].ProfileType)) = 0;
NoRecursion : SIZEOF(QUERY(temp <* Profiles | 'IFCPROFILERESOURCE.IfcCompositeProfileDef' IN TYPEOF(temp))) = 0;
END_ENTITY;

EXPRESS-G diagram

`

References: IfcMaterialProfileSet

Link to this page