IfcAnnotationSymbolOccurrence
Definition
from ISO/CD 10303-46:1992: An
annotation symbol occurrence is a symbol with a style assignment.
NOTE
Corresponding
STEP name: annotation_symbol_occurrence. Please refer to ISO/IS
10303-46:1994 for the final definition of the formal standard.
Definition from IAI: The IfcAnnotationSymbolOccurrence
shall only be used within a material or paper space
dependent representation (note: paper space is not yet supported within
this IFC release). Styled symbols within model
space shall use IfcStyledItem as the instance to
link the geometric symbol representation item to the (shared) style
information.
An IfcAnnotationSymbolOccurrence 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 a subtype of IfcDefinedSymbol.
The applicable style information is restricted to be an IfcSymbolStyle. For
each instance of a styled symbol,
one instance of IfcAnnotationSymbolOccurrence has
to be created, that points, via an IfcPresentationStyleAssignment,
to an IfcSymbolStyle, that can be shared by many
styled symbols.
HISTORY
New entity in
Release IFC2x
Edition 2.
EXPRESS specification:
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| ENTITY IfcAnnotationSymbolOccurrence
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| WR31
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NOT(EXISTS(SELF\IfcStyledItem.Item)) OR
('IFCPRESENTATIONDEFINITIONRESOURCE.IFCDEFINEDSYMBOL' IN TYPEOF (SELF\IfcStyledItem.Item));
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Formal Propositions:
| WR31
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The Item that is styled by an IfcAnnotationSymbolOccurrence relation shall be (if provided) an IfcDefinedSymbol.
NOTE If no Item is provided, the IfcAnnotationSymbolOccurrence is used to provide a symbol style to a material dependent presentation.
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Inheritance graph
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| ENTITY IfcAnnotationSymbolOccurrence;
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