IfcAnnotationTextOccurrence

Definition from ISO/CD 10303-46:1992: An annotation text occurrence is a text with a style assignment.

NOTE Corresponding STEP name: annotation_text_occurrence. Please refer to ISO/IS 10303-46:1994 for the final definition of the formal standard.

Definition from buildingSMART: The IfcAnnotationTextOccurrence shall only be used within a material or paper space dependent representation (note: paper space is not yet supported within this IFC release). Styled text within model space shall use IfcStyledItem as the instance to link the geometric text representation item to the (shared) style information.

An IfcAnnotationTextOccurrence is a relation object, that assigns a (set of) styles to a representation item. It can be used without having a geometric representation item already assigned, e.g. within an IfcMaterialDefinitionRepresentation. If it has a geometric representation item already assigned than this is further restricted to be an IfcTextLiteral. The applicable style information is restricted to be an IfcTextStyle. For each instance of a styled text, one instance of IfcAnnotationTextOccurrence has to be created, that points, via an IfcPresentationStyleAssignment, to an IfcTextStyle, that can be shared by many styled texts.

HISTORY New entity in Release IFC2x Edition 2.

EXPRESS specification:

ENTITY IfcAnnotationTextOccurrence

SUBTYPE OF (

IfcAnnotationOccurrence);

WHERE

WR31

NOT(EXISTS(SELF\IfcStyledItem.Item)) OR ('IFCPRESENTATIONDEFINITIONRESOURCE.IFCTEXTLITERAL' IN TYPEOF (SELF\IfcStyledItem.Item));

END_ENTITY;

Formal Propositions:

WR31

The Item that is styled by an IfcAnnotationTextOccurrence relation shall be (if provided) an IfcTextLiteral.

NOTE If no Item is provided, the IfcAnnotationTextOccurrence is used to provide a text style to a material dependent presentation.

Inheritance graph

ENTITY IfcAnnotationTextOccurrence;

ENTITY IfcRepresentationItem;

INVERSE

LayerAssignments

SET OF IfcPresentationLayerAssignment FOR AssignedItems;

StyledByItem

SET [0:1] OF IfcStyledItem FOR Item;

ENTITY IfcStyledItem;

Item

OPTIONAL IfcRepresentationItem;

Styles

SET [1:?] OF IfcPresentationStyleAssignment;

Name

OPTIONAL IfcLabel;

ENTITY IfcAnnotationOccurrence;

ENTITY IfcAnnotationTextOccurrence;

END_ENTITY;