When we talk about "open standards" and BIM, we are talking about non-proprietary file format and exchange protocol technologies that have been developed by public, private, and public/private entities. These include the following groups and base technology standards:
buildingSMARTalliance and buildingSMART International - home of Open BIM, IFC, and IFC-based standards, processes, and technologies
IFC - Industry Foundation Classes, the data model specification for building information modeling
MVD - Model View Definition, the specification for subsets of all available BIM data to serve a stated purpose or process
IDM - Information Delivery Manual, the business case specification for exchange BIM data, including end user Exchange Requirements (ERs)
IFD (bsDD) - International Framework for Dictionaries (buildingSMART Data Dictionary), a catalog of common industry concepts rationalizing varied terminology, due to language, market, or professional idioms, for the same concept.
- Construction Operations Building Information Exchange, an information
exchange specification for capturing BIM data related to building
OGC - Open Geospatial Consortium, international industry consortium for developing standards for geospatial data-enabled technologies
gbXML - Green Building XML, a file format schema for exchanging BIM data for building energy performance simulation and analysis
BIMXML - an XML schema developed to represent a simplified subset of BIM data for web services
PDF - Portable Document Format, originally developed by Adobe for the electronic exchange of any printable document.
DWF/DWFx - Design Web Format, originally developed by Autodesk, as a PDF alternative for CAD data/documentation