The IfcProductExtension further specialises the concepts of a (physical) product, i.e. a component likely to have a shape and a placement within the project context. The product information is provided for individual product occurrences as subtypes of IfcProduct, and for common specific product types as subtypes of IfcTypeProduct. Both definitions are rooted in supertypes provided within the IfcKernel. Basis concepts, introduced within the IfcProductExtension, are:
The spatial project structure defines
and its decomposition structure. In addition the concepts of system and zone are introduced within the IfcProductExtension. Relationships between the spatial structure and the elements are defined, such as spatial containment and space boundaries.
An element is assigned to the spatial project structure and may refer by its placement to a grid. Basic types of elements, which are introduced are
The other concepts introduced are