Web-based Collaborative Inquiries, Collaborative Annotation Techniques

Computer Supported Collaborative Design is a new trend in the design area under the computer-based network environment. One of the key problems of Collaborative design is how to realize Collaborative Query and Collaborative Annotation of the part's feature information and geometry information under the Web environment. STEP, which contains a large amount of data, and VRML, which lacks description of the part's geometry information and feature information, can not act as the carrier to describe the part's information under the Web environment. Therefore, it is one of hot research issues in Collaborative Design area that how to describe the information of the part, and finally realize the Collaborative Query and Collaborative Annotation.The thesis mainly focuses on the method of Collaborative Query and Collaborative annotation based on the Web. This method, based on the feature tree, employing VRML as Web publish data format of the 3D part, utilizing XML as the storage carrier of the part's feature information and geometry information of different CAD system, avoids the insufficiency of VRML information. The following several key technologies are studied in detail:· Utilizing XML to store the different feature and geometry information the part of different CAD systems.· Through the redevelopment of CAD system, the XML file including the part's feature information, and the VRML file including geometry information are retrieved.· Utilizing Applet and Java3D technologies realize geometry model browse and 3D operation of geometry model in the Web· Employing Middleware technology implements Collaborative Query and Collaborative annotation. Utilizing XQuery to query the part's feature information and DOM to modify the annotation information.