1. Information retrieval language should be able to express document content, data or other information forms. In order to meet the needs of different information users, information retrieval languages should be able to express different types according to different information needs. For example, when retrieving the performance of a certain equipment, the information retrieval language should be able to express some data indicators; When searching for the structure of a substance, you can also express the name and structure of the substance.
2. There is a special concept to express users' information problems. Information retrieval is not only a literal combination, but a conceptual match. For example, computer drawing, here are two terms, both of which are detachable and combinable. After disassembly, information such as computer problem solving, computer control, computer maintenance and computer drawing can be found according to the computer. But "drawing" involves art drawing, engineering drawing, computer drawing and so on.
Question 2: What is an information retrieval language? What kinds of retrieval languages are there? It is pointed out that the key words in "Chinese" are the conciseness of the title and the main idea of the article, which may not necessarily appear in the article, but may be the author's summary and summary language of the main idea of the article.
Keywords are keywords in articles, which usually appear in articles.
Question 3: What are the four kinds of information retrieval languages that reflect the internal and external characteristics of information? Topic language and classification language. There are author language and digital language that reflect the external characteristics of information.
Question 4: What is an information retrieval language and how many retrieval languages are there? It is pointed out that China Library Classification is the abbreviation of China Library Classification, and it is a common tool for book classification in China at present. If readers master the relevant knowledge of this classification, they can quickly and effectively search the collections of libraries all over the country.
Basic structure of classification
(1) Basic categories: For example, China Library Classification is divided into five categories: Marxism-Leninism, Mao Zedong and Deng Xiaoping; Philosophy; Social science; Natural science; Comprehensive books.
(2) Basic category: the first category that constitutes the classification table. There are 22 basic categories in China Library Classification.
(3) Summary table: a list of categories formed by basic categories and the first and second categories directly developed by them. For example:
(4) Detailed List: A list of categories consisting of various registered categories is the real basis for literature classification.
According to the characteristics of books and materials, the classification system is determined according to the principle of compiling from total to sub-division and from general to specific, and 22 categories are formed on the basis of 5 basic categories. The symbol of China Library Classification adopts the mixed number of Chinese phonetic alphabet and * * * number. That is, a letter represents a big category, and the order of big categories is embodied in alphabetical order. The letters are followed by numbers, indicating the division of the following categories. Numbers are numbered in decimal.
Question 5: What is an information retrieval language and how many retrieval languages are there? It is pointed out that the five categories of Chinese Library Classification need to be expressed in a certain language, so that the retrieval process, that is, document identification and information questioning, can be carried out smoothly. Only with the help of this language can document indexers and retrieval personnel have a common agreement and communicate with each other. That is to say, the internal and external features of documents are described in a certain language when they are stored, and information questions are expressed in a certain language when they are retrieved. This kind of language is called retrieval language, which links the storage and retrieval of documents, and links indexers and retrieval personnel to achieve mutual understanding and communication.
Type of retrieval language:
According to the nature and principle of logo, it can be divided into three categories: ① classification language, ② theme language and ③ code language.
(1) Classified language refers to a retrieval language which takes numbers, letters or the combination of letters and numbers as basic characters, adopts the writing method of directly connecting characters and taking dots (or other symbols) as separators, takes basic categories as basic vocabulary, and expresses complex concepts with the subordination of categories.
Well-known classifications include International Decimal Classification, Library of Congress Book Classification, International Patent Classification Table, Chinese Library Book Classification and so on.
② Thematic language refers to a retrieval language with natural language characters, noun terms as basic vocabulary and a group of noun terms as retrieval marks. The information processing method of describing and expressing information content in topic language is called topic method. Topic language can be divided into headline words, meta words, narrative words and keywords.
(3) Code language refers to the characteristics of a certain aspect of things, and uses a certain code system to express and arrange the concepts of things, thus providing a retrieval language for retrieval. For example, according to the code language of compound molecular formula, a molecular formula index system can be constructed, which allows users to search the corresponding compounds and their related literature information from the molecular formula.
Secondly, according to the characteristics of the expression documents, it can be divided into: ① the retrieval language that expresses the external characteristics of the documents; ② The retrieval language that expresses the characteristics of literature content.
① Main index questions (titles), author's name, publishing unit, report number, patent number, etc. of the retrieval language expressing the external characteristics of documents. Different documents are arranged according to the word order of article title and author's name, or according to the numerical order of report number and patent number, and the retrieval language that meets the needs of users is formed through the retrieval method of article title, author and number.
② The retrieval language that expresses the content characteristics of documents mainly refers to the topics, viewpoints, viewpoints and conclusions discussed.
China Library Classification is the abbreviation of China Library Classification, and it is a common tool for book classification in China at present. If readers master the relevant knowledge of this classification, they can quickly and effectively search the collections of libraries all over the country.
Basic structure of classification
(1) Basic categories: For example, China Library Classification is divided into five categories: Marxism-Leninism, Mao Zedong and Deng Xiaoping; Philosophy; Social science; Natural science; Comprehensive books.
(2) Basic category: the first category that constitutes the classification table. There are 22 basic categories in China Library Classification.
(3) Summary table: a list of categories formed by basic categories and the first and second categories directly developed by them. For example:
(4) Detailed List: A list of categories consisting of various registered categories is the real basis for literature classification.
According to the characteristics of books and materials, the classification system is determined according to the principle of compiling from total to sub-division and from general to specific, and 22 categories are formed on the basis of 5 basic categories. The symbol of China Library Classification adopts the mixed number of Chinese phonetic alphabet and * * * number. That is, a letter represents a big category, and the order of big categories is embodied in alphabetical order. The letters are followed by numbers, indicating the division of the following categories. Numbers are numbered in decimal. The five basic categories and the 22 categories under them are as follows:
One Marxism, one Leninism, one ideology and one theory.
A 1 works of Marx and Engels
A2 Lenin's works
A3 Stalin's Works
A4 *** works
A49 *** works
A5 Collection of Works of Marx, Engels, Lenin and Stalin * * *
A7 Life and Biographies of Marx, Engels, Lenin and Stalin, * * *, * * *
A8 Study and study Marxism–Leninism, thoughts and theories.
Philosophy, religion
B0 philosophy theory
B 1 world philosophy
B2 China's philosophy
B3 Asian philosophy
B4 African philosophy
B5 European philosophy
B6 Oceania philosophy
B7......& gt& gt
Question 6: What is the information retrieval language? What kinds of retrieval languages are there? It points out that there are five categories of Chinese Library Classification. A snowstorm makes her feel colder.