As an important resource under the background of digital design technology, 3D assembly model plays a great role in many complex product occasions. Based on existing database, how to find and reuse effective information that meets their own needs models is one ways provide efficiency. The research content this paper build general according requirements model. common structure, structure aims in...

XML data is often modeled as node-labeled trees. In a structure-generic relational storage scheme, the structure of the XML data is shredded into pieces of a generic type, such as nodes or edges, and data representing these structural pieces is stored in relational tables. In this paper, we consider four structure-generic relational storage schemes. We describe the translation of XML queries in...