关键词: 政务信息资源, 元数据, 关键词检索, 语义相关度, 可扩展标记语言（XML）

Abstract: Government information resources retrieval is important function in directory service system.Based on the XML metadata standard stipulated in national standards of Government information resource directory system，a keywords search algorithm is proposed，which uses the XML TF*IDF ranking strategy of government information resource metadata and the keywords dependence to rank the individual matches by semantic relevance.An improved keywords inverted index is proposed to improve the query efficiency.The experimental results show that this algorithm can greatly improve the rank accuracy of search results as well as the time efficiency，which can effectively improve the data-sharing ability of government information resource.

Key words: government information resource, metadata, keyword search, semantic relevance, Extensible Markup Language（XML）