1. What is Model View Definition (MVD)?
The IFC schema structure is modular and includes elements for specific domains, such as Architecture, Structural Analysis, Electrical Installation, etc.
IFC aims to create an interface among various tools to exchange information. However, not each program has an internal data schema that stores all specific classes in each domain. Let us remind that there are about 12000 of them.
Think, for example, of Tekla Structures modeling software. It doesn’t include data about the humidifier (IfcHumidifierType) or the occupant (IfcOccupant). Such information may be useful for creating a simulation of the building’s climate and energy balance or evacuation simulation, thus it isn’t included in the program.
It should, therefore, be clarified which subset of all IFC schema data is needed during the exchange for a specific application. In other words, which information needs to be filtered from the entire IFC schema.
Such subsets of data can be defined by analyzing the general schema of IFC in smaller “packages”, namely the MVD. They define the user requirements for necessary information. The MVD describes which objects, representations, relationships, concepts, and attributes are necessary for the project participant and the application to perform the requested task.
The Model View Definition also specifies which part of the IFC schema is implemented by a given program.
The developers of each software can choose the list of IFC classes, which support IFC import and export features. It means they can create their own Model View Definitions.
It’s important to realize that in fact, every IFC export feature in every program is based on the MVD.
2. Examples of MVD
The most common type of MVD for IFC version 2×3 is the Coordination View. The Coordination View is a filtered version of the full IFC schema. It’s also created to coordinate the project among multiple users and disciplines in the project. Eventually, it’s one of the main IFC applications in BIM technology.
Official buildingSmart MVD’s for IFC 2×3
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