Class TIfcLibraryReference

Unit

Declaration

type TIfcLibraryReference = class(TIfcExternalReference)

Description

IFC class IfcLibraryReference.

Source: scene/load/ifc/castleifc_ifc_standard_types_autogenerated.inc (line 581).

Hierarchy

Show Additional Members:

Overview

Methods

Protected function WantsGlobalId: Boolean; virtual;
Protected class function IfcClassName: String; virtual;
Public constructor Create(AOwner: TComponent); override;
Public destructor Destroy; override;

Properties

Published property GlobalId: String read FGlobalId write FGlobalId;
Published property Location: TIfcURIReference read FLocation write FLocation;
Published property Identification: TIfcIdentifier read FIdentification write FIdentification;
Published property Name: TIfcLabel read FName write FName;
Published property HasExternalReferenceForResources: TIfcExternalReferenceRelationshipList read FHasExternalReferenceForResources;

Description

Methods

Protected function WantsGlobalId: Boolean; virtual;

This item is declared in ancestor TIfcPersistent.

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;

This item is declared in ancestor TIfcPersistent.

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).

Public constructor Create(AOwner: TComponent); override;

This item is declared in ancestor TIfcExternalReference.

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1172).

Public destructor Destroy; override;

This item is declared in ancestor TIfcExternalReference.

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1173).

Properties

Published property GlobalId: String read FGlobalId write FGlobalId;

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).

Published property Location: TIfcURIReference read FLocation write FLocation;

This item is declared in ancestor TIfcExternalReference.

Location, where the external source (classification, document or library) can be accessed by electronic means. The electronic location is provided as an URI, and would normally be given as an URL location string.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1179).

Published property Identification: TIfcIdentifier read FIdentification write FIdentification;

This item is declared in ancestor TIfcExternalReference.

Unique identifier of the referenced item within the external source (classification, document or library).

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1183).

Published property Name: TIfcLabel read FName write FName;

This item is declared in ancestor TIfcExternalReference.

Optional name to further specify the reference. It can provide a human readable identifier (which does not necessarily need to have a counterpart in the internal structure of the document).

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1188).

Published property HasExternalReferenceForResources: TIfcExternalReferenceRelationshipList read FHasExternalReferenceForResources;

This item is declared in ancestor TIfcExternalReference.

Reference to all associations between this external reference and objects within the IfcResourceObjectSelect that are tagged by the external reference.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1193).


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