4.1 Project Context

All project data sets shall contain a single IfcProject instance indicating overall context and a directory of objects contained within. The context definition may include:

• the default units
• the geometric representation context for the shape representations
• the global positioning of the project coordinate system
• the reference to classification systems, or other external information sources, used
• the registry of object types and property templates used in the project context

Figure 1 illustrates an instance diagram.

Figure 1 — Project Context

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