查询优化是异构信息集成系统中非常重要而又十分复杂的问题。
Query processing is one of the key techniques in HIIS, and query decomposition, scheduling and optimization are the central problems for query processing.
本体可以应用于知识管理、系统分析、异构信息集成等领域。
Ontology can be used in knowledge management, system analysis, and heterogeneous information integration.
该系统可提供各信息源灵活、动态发布自身服务的功能，从而为快速构建异构集成系统提供了性能保证。
The system provides the function of publishing the sources' services flexibly and dynamically, hence making it possible to construct heterogeneous integration system immediately.
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