All over the STREAMER project, data exchange via standardised data models of the Building Information Modelling (BIM) and Geographic Information System (GIS) areas played an important role. In many deliverables, it became obvious that the existing versions of the standards still have gaps and deficiencies. The corresponding experiences are documented in this report, and in most cases recommendations for specific improvements are stated. Furthermore, product spectrum, goals and organisation structure of the two most important standardisation bodies in the BIM area (buildingSMART International. bSI) and the GIS area (Open Geospatial Consortium, OGC) are described.

In the BIM area, the three standards mainly used in STREAMER are "Industry Foundation Classes" (IFC), "Model View Definition XML" (mvdXML) and "buildingSMART Data Dictionary" (bsDD), formerly called "International Framework for Dictionaries2 (IFD). The experiences gained in STREAMER resulted in altogether 24 different detailed recommendations, most of them (14) are related with the base standard IFC. Among these are proposals for improving the documentation, new implementer agreements, new or modified IFC entities, as well as suggestions for a number of new or extended property sets related with STREAMER relevant building properties. Part of them have already been submitted to the corresponding standardisation groups.

The mvdXML related recommendations (altogether 9) are related with the existing version 1.1 and the proposed next version 2.0 of the standard. They aim at improving the formal language to specify checking rules, and to enhance the readability of these rules. For bsDD, only the general recommendation to host attribute synonyms, including proprietary attributes from applications like Revit or SBEM is stated.

For representing GIS related data, mainly the CityGML standard was used in the STREAMER project. The report lists 14 topics where the base standard needs improvements or application specific extensions. This includes general problems like improving quality of the documentation, revising the CityGML module structure and naming concept, and generalising the Level of Detail (LoD) concept. Furthermore, specific suggestions for extending the CityGML functionality to represent the spatial structure of cities, city quarters and buildings, and utility networks are stated.