Published	`property GlobalId: String read FGlobalId write FGlobalId;`
Published	`property Name: TIfcLabel read FName write FName;`
Published	`property Description: TIfcText read FDescription write FDescription;`
Published	`property RelatingReference: TIfcExternalReference read FRelatingReference write FRelatingReference;`

Description

Methods

Protected function WantsGlobalId: Boolean; virtual;

If True, instances of this class will have GlobalId auto-assigned at saving, and they will be saved as part of the "data" list in IFC JSON files.

Strictly following the spec, this should be only defined for TIfcRoot, because only IfcRoot has GlobalId. In reality, we need GlobalId at TIfcPersistent to load some files, and we sometimes need WantsGlobalId = True to save some files.

Source: scene/load/ifc/castleifc_ifc_types.inc (line 52).

Protected class function IfcClassName: String; virtual;

Name for the IFC standard, used in IFC files. By default, this is just ClassName with prefix 'T' removed.

Source: scene/load/ifc/castleifc_ifc_types.inc (line 56).

Properties

Published property GlobalId: String read FGlobalId write FGlobalId;

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).

Published property Name: TIfcLabel read FName write FName;

A name used to identify or qualify the relationship.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1105).

Published property Description: TIfcText read FDescription write FDescription;

A description that may apply additional information about the relationship.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1108).

Published property RelatingReference: TIfcExternalReference read FRelatingReference write FRelatingReference;

An external reference that can be used to tag an object within the range of IfcResourceObjectSelect.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1146).

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