Definition from IAI: An annotation is a graphical representation
within the geometric (and spatial) context of a project, that adds a note or
meaning to the objects which constitutes the project model. Annotations include
additional line drawings, text, dimensioning, hatching and other forms of
graphical notes.
If available, the annotation should be related to the spatial context of
the project, by containing the annotation within the appropriate level of the
building structure (site, building, storey, or space). This is handled by the
IfcRelContainedInSpatialStructure relationship.
HISTORY: New entity in Release IFC2x
Edition 2.
Geometry Use Definitions
The geometric representation of any IfcAnnotation is given by the
IfcProductDefinitionShape and IfcLocalPlacement allowing multiple
geometric representations.
Local Placement
The local placement for any IfcAnnotation is defined in its
supertype IfcProduct. It is defined by the IfcLocalPlacement,
which defines the local coordinate system that is referenced by all geometric
representations.
- The PlacementRelTo relationship of IfcLocalPlacement
shall point (if given) to the local placement of the same
IfcSpatialStructureElement, which is used in the
ContainedInStructure inverse attribute, or to a spatial structure
element at a higher level, referenced by that.
- If the relative placement is not used, the absolute placement is
defined within the world coordinate system.
Styled Representations
The standard representation of IfcAnnotation is defined using the
styled item representation by IfcStyledRepresentation that holds the
style information assigned to the geometric representation items together with
the geometric representation items.
