IfcTextLiteralWithExtent

Semantic definitions at the entity

Entity definition

The text literal with extent is a text literal with the additional explicit information of the planar extent. An alignment attribute defines how the text box is aligned to the placement and how it may expand if additional lines of text need to be added.

Figure 373 shows the use of planar extent and box alignment to position the text string

IfcTextLiteralWithExtent_Fig1.png 8,1 KB

Figure 373 — Text literal with extent and alignment

The planar extent defines the box model within which the text is placed. Padding maybe defined in the text style that offsets the text from the box to its inside.

NOTE Entity adapted from text_literal_with_extent defined in ISO10303-46

HISTORY New entity in IFC2x2.

IFC2x3 CHANGE The IfcTextLiteralWithExtent has been changed by adding BoxAlignment.

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
4	Extent	IfcPlanarExtent	[1:1]	The extent in the x and y direction of the text literal.	X
5	BoxAlignment	IfcBoxAlignment	[1:1]	The alignment of the text literal relative to its position.	X

Formal Propositions

Rule	Description
WR31	The subtype of IfcPlanarExtent, IfcPlanarBox, should not be used to represent an Extent for the text literal.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @AssignedItems	S[0:1]	Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.	X
	StyledByItem	IfcStyledItem @Item	S[0:1]	Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.	X
IfcGeometricRepresentationItem
IfcTextLiteral
1	Literal	IfcPresentableText	[1:1]	The text literal to be presented.	X
2	Placement	IfcAxis2Placement	[1:1]	An IfcAxis2Placement that determines the placement and orientation of the presented string.	X
3	Path	IfcTextPath	[1:1]	The writing direction of the text literal.	X
IfcTextLiteralWithExtent
4	Extent	IfcPlanarExtent	[1:1]	The extent in the x and y direction of the text literal.	X
5	BoxAlignment	IfcBoxAlignment	[1:1]	The alignment of the text literal relative to its position.	X

Formal representations

XSD Specification

 <xs:element name="IfcTextLiteralWithExtent" type="ifc:IfcTextLiteralWithExtent" substitutionGroup="ifc:IfcTextLiteral" nillable="true"/>

 <xs:complexType name="IfcTextLiteralWithExtent">

  <xs:complexContent>

   <xs:extension base="ifc:IfcTextLiteral">

    <xs:sequence>

     <xs:element name="Extent" type="ifc:IfcPlanarExtent" nillable="true"/>

    </xs:sequence>

    <xs:attribute name="BoxAlignment" type="ifc:IfcBoxAlignment" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcTextLiteralWithExtent

 SUBTYPE OF (IfcTextLiteral);

  Extent : IfcPlanarExtent;

  BoxAlignment : IfcBoxAlignment;

 WHERE

  WR31 : NOT('IFCPRESENTATIONDEFINITIONRESOURCE.IFCPLANARBOX' IN TYPEOF(Extent));
END_ENTITY;

 EXPRESS-G diagram

	Text - Buchstabensymbole mit geometrischer Ausdehnung
	Text Literal With Extent