中文摘要：

介绍了语义Web的关键技术XML、RDF（S）和本体,并指出了语义Web技术的众多应用领域：知识管理、语义搜索、P2P、电子商务、电子政务、语义网格、Web挖掘、语义Web服务、智能信息Agent和语义门户等。从这些领域当前面临的困难和挑战出发,分析和论述了语义Web技术在这些应用领域的作用、应用前景和部分研究成果。

英文摘要：

The key technologies of semantic web, XML, RDF （S） and ontology are introduced. Many application fields are given, such as knowledge management, semantic search, P2P, e-business, e-government, semantic grid, web mining, semantic web services, intelligent information agent and semantic portal. After analyzing the difficulty and challenge faced by these fields, semantic web＇ s functions, application trend and some research result are described.