关键词: P2P，元数据，语义检索，语义扩展路由

Abstract: Supporting semantic ctuery is one of key technictues which broaden P2P systems' applications. A semantic supported hybrid P2P network model-M-Chord was proposed. It adopts a metadata-specification-templatcbased semantic description model and combines technical characteristics of Chord and semantic overlay. A MST-based semantic overlay construction approach was designed. In MChord, the concept of semantic query routing was proposed. Based on M-Chord network model, semantic query method was proposed. The experiments show that scalability and semantic search efficiency are improved greatly in MChord.

Key words: P2P, Mctadata, Semantic query, Semantic extend routing