ISO 16739 PDFISO 16739 PDF

Official Release Date of buildingSMART’s IFC4 – March Official Release Date of ISO – March What’s new in IFC4? IFC4 – the new. The new IFC release IFC4 is now also accepted as an ISO standard. ISO has reached the status of a published International Standard. second as an ISO International Standard ISO – see home/store/catalogue_tc/?csnumber= This marks.

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It is a platform neutral, open file format specification that is not controlled by a single vendor or group of vendors.

It is an object-based file format with a data model developed by buildingSMART formerly the International Alliance for Interoperability, IAI to facilitate interoperability in the architectureengineering and construction AEC industry, and is a commonly used collaboration format in Building information modeling BIM based projects.

The IFC model specification is open and available.

IFC4 as ISO standard — Welcome to

Because of its focus on ease of interoperability between software platforms, the Jso government has made the use of IFC format s compulsory for publicly aided building projects. Twelve US companies joined the consortium.

IFC defines multiple file formats that may be used, supporting various encodings of the same underlying data. At the most abstract level, IFC divides all entities into rooted and non-rooted entities. Rooted entities derive from IfcRoot and have a concept of identity having a GUIDalong with attributes for name, description, and uso control.

Industry Foundation Classes

Non-rooted entities do not have identity and instances only exist if referenced from a rooted instance directly or indirectly. IfcRoot is subdivided into three abstract concepts: IfcObjectDefinition is split into object occurrences and object types. IfcObject captures object occurrences such as a product installation having serial number and physical placement.


IfcTypeObject captures type definitions or templates such as a product type having a particular model number and common shape. Occurrences and types are isk subdivided into six fundamental concepts: IfcRelationship captures ios among objects.

There are five fundamental relationship types: IfcPropertyDefinition captures dynamically extensible property sets. A property set contains one or more properties which may be a single value e. While IFC defines several hundred property sets for specific types, custom 166739 sets may be defined by application vendors or end users. IfcProduct is the base class for all physical objects and is subdivided into spatial elements, physical elements, structural analysis items, and other concepts.

Products may have associated materials, shape representations, and placement in space. Distribution elements HVACelectricalplumbing have a concept of ports where elements may have specific connections for various services, and connected together using cables, pipes, or ducts to form a system.

Industry Foundation Classes – Wikipedia

Various connectivity relationships 17639 used for building elements such as walls having openings filled by doors or windows. Materials may be defined for products as a whole, or as layers, profiles, or constituents for specified parts. Representations may be defined for explicit 3D shape, and optionally as parametric constraints.

Each representation is identified by IfcShapeRepresentation with a well-known name. IFC defines various quantities specific to each element type and the method of calculation according to geometry and relationships. IfcProcess is the base class for processes and is 116739 into tasks, events, and procedures. Processes may have durations and be scheduled to occur at specific time periods.

Processes may be sequenced such that a successor task may start after a predecessor task finishes, following the Critical Path Method.

Processes may be nested into sub-processes for summary roll-up. Processes may be assigned to products indicating the output produced by the work performed. IfcResource is the base class for resources and is subdivided into materials, labor, equipment, subcontracts, crews, and more.


Resources may have various costs and calendars of availability. Resources may be nested into sub-resources for granular allocation. Resources may be assigned to processes indicating tasks performed on behalf of a resource. IfcProject encapsulates an overall project and indicates the project name, description, default units, currency, coordinate system, and other contextual information.

A valid IFC file must always include exactly one IfcProject instance, from which all other objects is directly or indirectly.

In addition to project-specific information, an IfcProject may also reference external projects from which shared definitions may be imported such as product types. Projects support revision control where any IfcRoot-based entity has a unique identifier and may be marked as added, modified, deleted, or having no change.

Such capability allows multiple IFC files to be merged deterministically, ensuring data isi without human intervention.

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Building information modeling BIM.

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