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中文摘要：
数据模型是XML数据管理领域研究的核心问题之一．现有的数据模型在表达XML数据库复杂的数据结构和操作方面仍有不足．以映射为基础，提出了一种新的数据模型．该数据模型给出了XML数据库复杂的数据结构和语义的精确定义，并提供了数据结构上操作代数的定义，包括路径表达式操作和数据维护操作．该数据模型已应用于一个基于XML的信息集成系统中．事实表明，它能够有效地支持XML数据管理的应用．
英文摘要：
Data model is a key research field in the community of XML data management. However, the existed works fall short in their ability to model complex data structure of XML database or to support complete operations. This paper proposes a new mapping-based data model. This model aims to give the precisely defined notations for complex data structure and semantics of XML database, Along with the model, this paper also presents an associated algebra formally which includes a set of path expression operations and data modification operations. This model has already adopted in an XML-based information integration system. It shows that this model can give the precise semantics of XML database, and support the XML database applications effectively.
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