Class TIfcGeometricRepresentationContext

This item is declared in ancestor TIfcPersistent.

Globally unique identifier for the object instance.

Note: Not declared as TGUID, because TGUID cannot be published, but also we don't really need it: for our purposes, this identifier is just an arbitrary string.

Note: IFC 4.3 specification puts this only at IfcRoot, not at every IFC class. But testcase https://github.com/buildingsmart-community/Community-Sample-Test-Files/blob/main/IFC%204.0.2.1%20(IFC%204)/ISO%20Spec%20archive/wall-with-opening-and-window.json (from IFC 4.0) shows this can be present at any IFC class, in particular TIfcGeometricRepresentationContext.

In fact, TIfcGeometricRepresentationContext needs to have GlobalId to be successfully saved (avoid recursively trying to serialize it) in some cases. We indicate such classes with WantsGlobalId.

IFC JSON documentation says this, which seems to (unfortunately it is not unambiguous enough...) allow this at any IFC class: "Whereas the globalId attribute is only available to those elements that are descendent of the IfcRoot entity in the EXPRESS schema, we encourage a broader use of this globalId, to enable referencing between objects in a JSON file when useful.".

Source: scene/load/ifc/castleifc_ifc_types.inc (line 79).

This item is declared in ancestor TIfcRepresentationContext.

The optional identifier of the representation context as used within a project.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4789).

This item is declared in ancestor TIfcRepresentationContext.

The description of the type of a representation context. The supported values for context type are to be specified by implementers agreements.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4793).

This item is declared in ancestor TIfcRepresentationContext.

All shape representations that are defined in the same representation context.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4796).