4.1.9.2 Project Declaration
The project provides a directory of object types and property templates contained within using declaration relationships.
The actual object occurrences used within the context of a project, such as walls, beams, air outlets, are assigned to a spatial hierarchy that is linked to the project using the aggregation hierarchy. See concept Spatial Decomposition for linking a spatial structure to the project. New concept template enabled by schema enhancements in IFC4.The following diagram shows the generic classes and relationships used when applying this concept. In addition, concepts may have particular importance to common or standardised industry practices and scenarios. For these specific usage scenarios, the table below shows a recommended list of general usage patterns that users may adopt.
General Usage
| ApplicableEntity | Type IfcRelDeclares.RelatedDefinitions |
|---|---|
| IfcProject | IfcActor |
| IfcProject | IfcControl |
| IfcProject | IfcGroup |
| IfcProject | IfcProcess |
| IfcProject | IfcProjectLibrary |
| IfcProject | IfcPropertySetTemplate |
| IfcProject | IfcResource |
| IfcProject | IfcTypeObject |