一种基于XML Schema的异构资源数据库整合中间件

将异构资源数据库整合到数字图书馆系统中所面对的首要问题是异构问题 ,主要包括系统异构、语法异构和语义异构三个方面。本文以W3C的XMLSchema标准作为异构数据源的全局模式 ,借助XMLSchema强的数据描述能力 ,通过实现关系模式的提取、关系模式到XMLSchema的转化和附加语义约束 ,实现了异构资源数据库数据的整合

A Method for Merging XML Schema Based Heterogeneous Resource Databases

A digital library (DL) needs interoperation between diverse information services. In order to use the legacy heterogeneous resource databases in one single DL, their information requires merging into one common virtual model to facilitate the operation and interoperation. Heterogeneity, structure and semantic relationship extension are the main challenges in the process of merging. To solve these problems, we define a directed-graph data model as the common data model and propose a merging approach based on XML Schema which captures the full structures and semantic constraints in relational schema, translates them into the global XML Schema representations and merges the result through adding semantic content constraints. In addition, a security model that allows for authentication and authorization are implemented for the method to satisfy the authorization required in the merging process.