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This study proposes a theoretical framework for using an XML-based building information description. The framework enables computer-based information systems to easily share and exchange building information, to visualize spatial aspects of buildings. The BSDL framework which was proposed in an earlier research work, provided a way of describing physical aspects of certain building types. The framework was promising in that it could fit to the XML-aware software applications while the human user was able to grasp the spatial configurations of buildings with relative ease. It had its own limitations, however, due to the fact that the framework considered the building system in a top-down way so that the buildings were described only at the conceptual level, leaving the implementation matters open-ended. Aa a result, the framework did not sufficiently provided information for specific implementation. On the other hand, as the eventual goal of the framework was to provide a standard for product data exchange method, it is desirable to reference international standards and go parallel with the international research trends. The IFC model is analyzed in this context, and the XML-based IFC model data exchange efforts are examined such as BLIS-XML of the IAI. An enhanced version of BSDL framework is presented by integrating such research works, and more implemetation issues are addressed.