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美国《医学索引》除了有明确的主题词字顺表和完整的参照系统以外,还有一个值得重视的检索手段,即使用范畴表(树形结构)进行分类检索。因此,“字顺表”和“范畴表”构成了“医学主题词表”《MeSH》(Medical Subject Hea-dings)。当前把主题法和分类法结合起来检索是检索方法中的一个重要发展阶段,它把主题法的专指性、直接性、灵活性和分类法的系统性、稳定性结合了起来,使检索手段更加完备,这是美国《医学索引》的一大特点。受到了广大读者的重视。范畴表是《MeSH》的后半部分,它是由“主题词”构成的结构严密的检索体
In addition to a clear thesaurus and a complete reference system, the United States Medical Index has a worthy search method that uses category tables (tree structure) for classified search. Therefore, “word order list” and “category list” constitute “Medical Subject Hea-dings”. At present, the combination of subject method and taxonomy is an important stage in the retrieval method. It combines the specificity, directness, flexibility and the systematicness and stability of the subject method in the retrieval method, More complete, this is a major feature of the U.S. “Medical Index.” By the majority of readers attention. The category list is the second half of “MeSH” and is a structured searcher consisting of “keywords”