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This part of ISO 10303 specifies the use of the integrated resources necessary for the scope and information requirements for the exchange of building element shape, property, and spatial configuration information between application systems with explicit shape representations. Building elements are those physical things of which a building is composed, such as structural elements, enclosing and separating elements, service elements, fixtures and equipment, and spaces.

Building element shape, property, and spatial configuration information requirements can be used at all stages of the life cycle of a building, including the design process, construction, and maintenance. Building element shape, property, and spatial configuration information requirements specified in this part of ISO 10303 support the following activities:

• concurrent design processes or building design iterations;
• integration of building structure designs with building systems designs to enable design analysis;
• building design visualization;
• specifications for construction and maintenance;
• analysis and review.

EXAMPLE 1 - A design analysis function combines the building structure design with building service systems designs (for systems such as heating, ventilation, and air condition (HVAC) and piping) to check for interferences of the structural elements with piping and air conditioning elements.

The following are within the scope of this part of ISO 10303:

• explicit representation of the three-dimensional shape of building elements using boundary representation (B-rep) solid models, swept solid models, or constructive solid geometry (CSG) models.
• the spatial configuration of building elements that comprise the assembled building;
• building structures that represent physically distinct buildings that are part of a single building complex;
• non-structural elements that enclose a building or separate areas within a building;
• the shape and arrangement of equipment and service elements that provide services to a building;

EXAMPLE 2 - Service elements include items such as plumbing, ductwork, and conduits. Equipment includes items such as compressors, furnaces, or water heaters.

• the shape and arrangement of fixtures in a building;

EXAMPLE 3 - Fixtures include items such as furniture and installed items like doorknobs.

• specification of spaces and levels;

EXAMPLE 4 - Spaces include rooms, accesses, and hallways. Levels include concepts such as floors and mezzanines of a building.

• the shape of the site on which the building will be erected;
• specification of properties of building elements, including material composition;
• specification of classification information;

EXAMPLE 5 - Elements may be classified for reasons which include cost analysis, acoustics, or safety.

• association of properties and classification information to building elements;
• changes to building element shape, property, and spatial configuration information;
• association of approvals with building element shape, property, and spatial configuration information;
• as-built record of the building.

The following are outside the scope of this part of ISO 10303:

• 2D shape representation and draughting presentation;
• the contents of building standards;
• implicit representation of building elements through selection of standard parameters;
• structural analysis of building structures, including loads, connections, and material properties required for analysis;
• thermal analysis of buildings;
• the assembly process, joining methods, and detailed connectivity of building elements;
• building maintenance history, requirements, and instructions;
• approval, revision, versioning, and design change histories;
• building elements without explicit shape representation;
• bills of quantities.