IfcTextLiteralWithExtent

Natural language names
Text - Buchstabensymbole mit geometrischer Ausdehnung
Text Literal With Extent
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 553 shows the use of planar extent and box alignment to position the text string

"IfcTextLiteralWithExtent_Fig1.png 8,1 KB"

Figure 553 — 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
#AttributeTypeCardinalityDescription G
4ExtentIfcPlanarExtent The extent in the x and y direction of the text literal. X
5BoxAlignmentIfcBoxAlignment The alignment of the text literal relative to its position. X
Formal Propositions
RuleDescription
WR31The subtype of IfcPlanarExtent, IfcPlanarBox, should not be used to represent an Extent for the text literal.
Inherited definitions from supertypes
Entity inheritance IfcTextLiteral IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRepresentationItem
LayerAssignmentIfcPresentationLayerAssignment
@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.
IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added.
IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
X
StyledByItemIfcStyledItem
@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.
IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
X
IfcGeometricRepresentationItem
IfcTextLiteral
1LiteralIfcPresentableText The text literal to be presented. X
2PlacementIfcAxis2Placement An IfcAxis2Placement that determines the placement and orientation of the presented string. X
3PathIfcTextPath The writing direction of the text literal. X
IfcTextLiteralWithExtent
4ExtentIfcPlanarExtent The extent in the x and y direction of the text literal. X
5BoxAlignmentIfcBoxAlignment The alignment of the text literal relative to its position. X
Formal representations
XML 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;

Link to EXPRESS-G diagram EXPRESS-G diagram

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