Class TIfcPropertySetTemplate

Unit

Declaration

type TIfcPropertySetTemplate = class(TIfcPropertyTemplateDefinition)

Description

Template for all dynamically extensible property sets represented by IfcPropertySet.

Spec: https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcPropertySetTemplate.htm

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4966).

Hierarchy

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Overview

Methods

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

Properties

Published property GlobalId: String read FGlobalId write FGlobalId;
Published property OwnerHistory: TIfcOwnerHistory read FOwnerHistory write FOwnerHistory;
Published property Name: TIfcLabel read FName write FName;
Published property Description: TIfcText read FDescription write FDescription;
Published property HasContext: TIfcRelDeclares read FHasContext write FHasContext;
Published property HasAssociations: TIfcRelAssociatesList read FHasAssociations;
Published property TemplateType: TIfcPropertySetTemplateTypeEnum read FTemplateType write FTemplateType default TIfcPropertySetTemplateTypeEnum.NotDefined;
Published property ApplicableEntity: TIfcIdentifier read FApplicableEntity write FApplicableEntity;
Published property HasPropertyTemplates: TIfcPropertyTemplateList read FHasPropertyTemplates;
Published property Defines: TIfcRelDefinesByTemplateList read FDefines;

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).

Protected function WantsGlobalId: Boolean; override;

This item has no description. Showing description inherited from TIfcPersistent.WantsGlobalId.

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_standard_types.inc (line 1656).

Public constructor Create(AOwner: TComponent); override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1780).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1781).

Public constructor Create(AOwner: TComponent); override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4973).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4974).

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 OwnerHistory: TIfcOwnerHistory read FOwnerHistory write FOwnerHistory;

Information about the current ownership of that object.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1659).

Published property Name: TIfcLabel read FName write FName;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1661).

Published property Description: TIfcText read FDescription write FDescription;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1662).

Published property HasContext: TIfcRelDeclares read FHasContext write FHasContext;

Reference to the relationship IfcRelDeclares and thus to the IfcProject or IfcProjectLibrary.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1785).

Published property HasAssociations: TIfcRelAssociatesList read FHasAssociations;

Reference to the relationship IfcRelAssociates and thus to those externally defined concepts, like classifications, documents, or library information, which are associated to the property definition.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1790).

Published property TemplateType: TIfcPropertySetTemplateTypeEnum read FTemplateType write FTemplateType default TIfcPropertySetTemplateTypeEnum.NotDefined;

Property set type defining whether the property set is applicable to a type (subtypes of IfcTypeObject), to an occurrence (subtypes of IfcObject), or as a special case to a performance history.

The attribute ApplicableEntity may further refine the applicability to a single or multiple entity type(s).

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4982).

Published property ApplicableEntity: TIfcIdentifier read FApplicableEntity write FApplicableEntity;

The attribute optionally defines the data type of the applicable type or occurrence object.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4987).

Published property HasPropertyTemplates: TIfcPropertyTemplateList read FHasPropertyTemplates;

Set of IfcPropertyTemplate's that are defined within the scope of the IfcPropertySetTemplate.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4991).

Published property Defines: TIfcRelDefinesByTemplateList read FDefines;

Relation to the property sets, via the objectified relationship IfcRelDefinesByTemplate, that, if given, utilize the definition template.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 4995).


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