主题语言（Subject language）.doc

主题语言（Subject language） Chapter 1, a brief account of the subject language (Chen Weiying) What is the theme language? The so-called theme language is natural language word for the character to standardize or not standardized terminology of the basic vocabulary in the form of logic between the concept of grammar or word formation, word alphabetically, theme concept by reference system shows the relations between concepts of a class of retrieval language. Retrieve the meaning of an identification The so-called retrieval mark is to express the document information characteristic in succinct language form. The purpose is to distinguish and identify the content of the document, and to serve as the basis for the orderly storage and retrieval of the document information. This particular language is called an information retrieval language or a retrieval language. What is the order of reference? The order of reference, also called the order of composition, refers to the order of combinations or permutations of subject elements in indexing and retrieval of composite topics. Quote order subject language refers to the various factors in the title theme alphabetical order, is one of the important theme of the language syntax means, which determines the theme in search tools to check the position row. Common forms of wheel arrangement 1. simple round in indexing words, each word in turn placed in the entrance position, no reservation or statement does not maintain syntactic indexing, this form of literature to reveal the theme of the shallow, suitable for the group after the establishment of retrieval system. 2. words of permuterm is indexing the entrance statement 22 combination, form a pair, and then each word of an order, as a subject indexing, the other as a subtitle, the logo is specifically. 3. wheel row recirculating roller, is a way to keep the original query syntax relation of wheel line, when one has the retrieval expressions permuterm to the entrance position, entrance