Object-Oriented CAD Tool Implementations for the Construction Industry. (Tietokoneyhdennetyn Rakentamisen Oliopohjainen Sovelluskehitys)

摘要

The objective of the project described in the report - the OOCAD project - was to further refine and develop previous work in the Finnish construction industry concerning computerized methods for describing and designing buildings as product models. The work included the development of a formal generic product model on a conceptual level (the OOCAD model) based on object-oriented concepts and the definition of a neutral data exchange file format (the OXF-format) mapping the model as closely as possible. The model is based on a hierarchical composition of objects with part-of relationships where the data of real world entities, such as buildings, consist of two kinds of objects: types and instances. This dualism was introduced to avoid redundant data: the type objects describe the common data of one or several identical objects, such as shape and material, whereas the instance objects describe occurrence-specific data, such as position. (Copyright (c) 1993 Technical Institute of Finland.)