关键词: 寿命周期, 扩展超图数据模型, 概念路径, 基础映射, 嵌套映射

Abstract: To improve the efficiency of data exchange between data sources, and reduce the redundancy and errors, a data model named extension hyper graph data model as the common data model for life cycle information integration of equipments was proposed. Mechanism of schema mapping optimization based on nested mapping was studied. Method to judge nested mapping was provided. A new algorithm for automatic generation of nested mappings using the basic mappings was presented. Enquiry performance of mapping relationship before and after optimization was compared. Experiments showed that it could not only simplify mapping representation, reduce mapping storage scale, and improve efficiency of enquiry and data exchange.

Key words: life cycle, extension hyper graph data model, concept path, basic mapping, nested mapping