A study on XML data exchange with query optimization

我们的目标是开发基本的技术，利用XML文档符合一个模式，将其转换为符合另一个模式的文档。在这项研究中，我们已经采用了XML文档的查询语言，表示一个共同的结构的候选人转换的XML文档，因为这样的表示将是有用的查询优化。我们的贡献之一是几个条件，它可以有效地决定是否一个给定的表达式是一个给定的候选文件集的一个共同的结构。我们还处理了与数据交换有关的其他理论问题。

Our aim is to develop fundamental technologies for utilizing an XML document conforming to a schema by transforming it to a document conforming to another schema. In this research, we have adopted XPath, a query language to XML documents, to represent a common structure of candidates for transformed XML documents, because such representation will be useful for query optimization. One of our contributions is several conditions where it can be decided efficiently whether a given XPath expression is really a common structure of a given set of candidate documents. We have also tackled other theoretical problems related to data exchange.