This paper aims to develop a visual tool named Spatial Topology Retrieval (STR) for integrating a physicalbased spatial allocation tool, which offers a visual interactive interface for architectural space layout in the early design stage, into an online case library of architectural design, which is based on rational database technology with ontology-based authoring tools of metadata of case features. STR provides the case library with a tool for indexing and retrieving the plane views of a given architectural design case.Architectural design; case library; knowledge representation; implicit knowledge; spatial topology

This paper proposes a feasible approach named "Smart Spatial Ontology" for converting ontological declarations into topological relations and geometric features, which would then assist users to retrieve relevant cases from the case library. The purpose of this project is to extend the knowledge representing abilities of our design case library, which develops smart retrieval of spatial topology within plan drawings for assisting architectural design.

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