IfcExternallyDefinedTextFont

BACnet MVD

#### IfcExternallyDefinedTextFont

Natural language names

| Extern definiert - Schriftsatz
| Externally Defined Text Font

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcExternallyDefinedTextFont |  |  | MOVED | Schema changed from IFCPRESENTATIONRESOURCE to IFCPRESENTATIONAPPEARANCERESOURCE.
Location |  |  | MODIFIED | Type changed from IfcLabel to IfcURIReference.
Identification |  | X | MODIFIED | Name changed from ItemReference to Identification.

##### Semantic definitions at the entity

Entity definition

> NOTE Definition according to ISO/CD 10303-46:1992
> The externally defined text font is an external reference to a text font

> NOTE Restrictions of the font source and font names to be used may be exposed by implementation guidelines.

> NOTE Corresponding ISO 10303 name: externally_defined_text_font. Please refer to ISO/IS 10303-46:1994, p. 137 for the final definition of the formal standard.

> HISTORY New entity in IFC2x2.

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcExternalReference

1

Location

IfcURIReference

?

Location, where the external source (classification, document or library) can be accessed by electronic means. The electronic location is provided as an URI, and would normally be given as an URL location string.

> IFC4 CHANGE The data type has been changed from IfcLabel to IfcURIReference
> .

X

X

2

Identification

IfcIdentifier

?

The Identification provides a unique identifier of the referenced item within the external source (classification, document or library). It may be provided as

- a key, e.g. a classification notation, like NF2.3
- a handle
- a uuid or guid

It may be human readable (such as a key) or not (such as a handle or uuid) depending on the context of its usage (which has to be determined by local agreement).

> IFC4 CHANGE Attribute renamed from ItemReference for consistency.

X

X

3 | Name | IfcLabel | ? | Optional name to further specify the reference. It can provide a human readable identifier (which does not necessarily need to have a counterpart in the internal structure of the document). | X | X

ExternalReferenceForResources

IfcExternalReferenceRelationship
@RelatingReference

S[0:?]

Reference to all associations between this external reference and objects within the IfcResourceObjectSelect that are tagged by the external reference.

> IFC4 CHANGE New inverse attribute added with upward compatibility.

X

IfcExternallyDefinedTextFont

##### Formal representations

XML Specification
`<xs:element name="IfcExternallyDefinedTextFont" type="ifc:IfcExternallyDefinedTextFont" substitutionGroup="ifc:IfcExternalReference" nillable="true"/>
<xs:complexType name="IfcExternallyDefinedTextFont">
<xs:complexContent>
<xs:extension base="ifc:IfcExternalReference"/>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcExternallyDefinedTextFont
SUBTYPE OF (IfcExternalReference);
END_ENTITY;

EXPRESS-G diagram

`

References: IfcTextFontSelect

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