IfcTextStyleTextModel

Semantic definitions at the entity

Entity definition

The IfcTextStyleTextModel combines all text style properties, that affect the presentation of a text literal within a given extent. It includes the spacing between characters and words, the horizontal and vertical alignment of the text within the planar box of the extent, decorations (like underline), transformations of the literal (like uppercase), and the height of each text line within a multi-line text block.

Definition according to W3C for Cascading Style Sheets:
The properties defined in the text model affect the visual presentation of characters, spaces, words, and paragraphs.

NOTE Corresponding CSS1 definitions are Text properties (word-spacing, letter-spacing, text-decoration, vertical-align, text-transform, text-align, text-indent, line-height).

HISTORY New entity in IFC2x3.

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
1	TextIndent	IfcSizeSelect	[0:1]	The property specifies the indentation that appears before the first formatted line. NOTE It has been introduced for later compliance to full CSS support.	X
2	TextAlign	IfcTextAlignment	[0:1]	This property describes how text is aligned horizontally within the element. The actual justification algorithm used is dependent on the rendering algorithm.	X
3	TextDecoration	IfcTextDecoration	[0:1]	This property describes decorations that are added to the text of an element.	X
4	LetterSpacing	IfcSizeSelect	[0:1]	The length unit indicates an addition to the default space between characters. Values can be negative, but there may be implementation-specific limits. The importing application is free to select the exact spacing algorithm. The letter spacing may also be influenced by justification (which is a value of the TextAlign attribute). NOTE The following values are allowed, IfcDescriptiveMeasure with value='normal', IfcRatioMeasure, or IfcLengthMeasure, where the length unit is globally defined at IfcUnitAssignment.	X
5	WordSpacing	IfcSizeSelect	[0:1]	The length unit indicates an addition to the default space between words. Values can be negative, but there may be implementation-specific limits. The importing application is free to select the exact spacing algorithm. The word spacing may also be influenced by justification (which is a value of the 'text-align' property). NOTE It has been introduced for later compliance to full CSS support.	X
6	TextTransform	IfcTextTransformation	[0:1]	This property describes how text characters may transform to upper case, lower case, or capitalized case, independent of the character case used in the text literal. NOTE It has been introduced for later compliance to full CSS support.	X
7	LineHeight	IfcSizeSelect	[0:1]	The property sets the distance between two adjacent lines' baselines. When a ratio value is specified, the line height is given by the font size of the current element multiplied with the numerical value. A value of 'normal' sets the line height to a reasonable value for the element's font. It is suggested that importing applications set the 'normal' value to be a ratio number in the range of 1.0 to 1.2. NOTE The following values are allowed: IfcDescriptiveMeasure with value='normal', or IfcLengthMeasure, with non-negative values, the length unit is globally defined at IfcUnitAssignment, or IfcRatioMeasure.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcPresentationItem
IfcTextStyleTextModel
1	TextIndent	IfcSizeSelect	[0:1]	The property specifies the indentation that appears before the first formatted line. NOTE It has been introduced for later compliance to full CSS support.	X
2	TextAlign	IfcTextAlignment	[0:1]	This property describes how text is aligned horizontally within the element. The actual justification algorithm used is dependent on the rendering algorithm.	X
3	TextDecoration	IfcTextDecoration	[0:1]	This property describes decorations that are added to the text of an element.	X
4	LetterSpacing	IfcSizeSelect	[0:1]	The length unit indicates an addition to the default space between characters. Values can be negative, but there may be implementation-specific limits. The importing application is free to select the exact spacing algorithm. The letter spacing may also be influenced by justification (which is a value of the TextAlign attribute). NOTE The following values are allowed, IfcDescriptiveMeasure with value='normal', IfcRatioMeasure, or IfcLengthMeasure, where the length unit is globally defined at IfcUnitAssignment.	X
5	WordSpacing	IfcSizeSelect	[0:1]	The length unit indicates an addition to the default space between words. Values can be negative, but there may be implementation-specific limits. The importing application is free to select the exact spacing algorithm. The word spacing may also be influenced by justification (which is a value of the 'text-align' property). NOTE It has been introduced for later compliance to full CSS support.	X
6	TextTransform	IfcTextTransformation	[0:1]	This property describes how text characters may transform to upper case, lower case, or capitalized case, independent of the character case used in the text literal. NOTE It has been introduced for later compliance to full CSS support.	X
7	LineHeight	IfcSizeSelect	[0:1]	The property sets the distance between two adjacent lines' baselines. When a ratio value is specified, the line height is given by the font size of the current element multiplied with the numerical value. A value of 'normal' sets the line height to a reasonable value for the element's font. It is suggested that importing applications set the 'normal' value to be a ratio number in the range of 1.0 to 1.2. NOTE The following values are allowed: IfcDescriptiveMeasure with value='normal', or IfcLengthMeasure, with non-negative values, the length unit is globally defined at IfcUnitAssignment, or IfcRatioMeasure.	X

Formal representations

XSD Specification

 <xs:element name="IfcTextStyleTextModel" type="ifc:IfcTextStyleTextModel" substitutionGroup="ifc:IfcPresentationItem" nillable="true"/>

 <xs:complexType name="IfcTextStyleTextModel">

  <xs:complexContent>

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

    <xs:sequence>

     <xs:element name="TextIndent" nillable="true" minOccurs="0">

      <xs:complexType>

       <xs:group ref="ifc:IfcSizeSelect"/>

      </xs:complexType>

     </xs:element>

     <xs:element name="LetterSpacing" nillable="true" minOccurs="0">

      <xs:complexType>

       <xs:group ref="ifc:IfcSizeSelect"/>

      </xs:complexType>

     </xs:element>

     <xs:element name="WordSpacing" nillable="true" minOccurs="0">

      <xs:complexType>

       <xs:group ref="ifc:IfcSizeSelect"/>

      </xs:complexType>

     </xs:element>

     <xs:element name="LineHeight" nillable="true" minOccurs="0">

      <xs:complexType>

       <xs:group ref="ifc:IfcSizeSelect"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

    <xs:attribute name="TextAlign" type="ifc:IfcTextAlignment" use="optional"/>

    <xs:attribute name="TextDecoration" type="ifc:IfcTextDecoration" use="optional"/>

    <xs:attribute name="TextTransform" type="ifc:IfcTextTransformation" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcTextStyleTextModel

 SUBTYPE OF (IfcPresentationItem);

  TextIndent : OPTIONAL IfcSizeSelect;

  TextAlign : OPTIONAL IfcTextAlignment;

  TextDecoration : OPTIONAL IfcTextDecoration;

  LetterSpacing : OPTIONAL IfcSizeSelect;

  WordSpacing : OPTIONAL IfcSizeSelect;

  TextTransform : OPTIONAL IfcTextTransformation;

  LineHeight : OPTIONAL IfcSizeSelect;

END_ENTITY;

 EXPRESS-G diagram

	Textstil - Text - Modell
	Text Style Text Model
	Modèle de style de texte