【Key words】 ancient books of TCM； digitization； image； free indexing； post-controlled vocabulary； full-text retrieval；
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This paper introduces the concepts, features and establishing methods of the post-controlled vocabulary and some problems needing attention in the establishment of the post-controlled vocabulary.
介绍了后控制词表的概念、特点、建立方式及建立过程中需注意的问题。
The paper studies seven typical post-controlled vocabulary models, analyzes their basic principles, outlines their process procedures with examples and evaluates their performance.
本文将后控词表实现模式分为七类，在分析了各自的原理后，结合实例阐述了词表的实现过程，最后评价了各种模式的特性。
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