Question 1: What is the concept of information retrieval language (1)? In order to make the retrieval process, that is, document identification and information questioning, both need to be expressed in a certain language. 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. Search language is a set of words selected and standardized from natural language or professional literature (such as Chinese thesaurus and medical thesaurus). ◆ A set of classification numbers representing a certain classification system, such as Chinese Library Book Classification. ◆ A set of codes representing a certain aspect of a certain kind of thing (such as water molecular formula H2O). (2) The retrieval language type is 1, and the system classification languages (standardized languages) such as Chinese Library Book Classification and Dewey Decimal Classification. 2. Keyword retrieval language 1) Keywords (standardized theme language) are also called keywords, such as American medical thesaurus and China Chinese medical thesaurus. 2) Keywords are non-standard subject languages, which are words with practical significance except stop words. Example: To search the application literature of insulin pump in the treatment of severely burned patients with diabetes. Select keywords: burn, diabetes, insulin pump. 3) Title: title, article title, journal title, website, etc. Literature information resources. 4) Characters or strings in the whole content of full-text resources 5) Author, article title and words extracted from source documents 6) Author's subtitle modifies and restricts many aspects of a medical topic (narrative), also known as determiners. For example, the theme of "pigmented tumor" involves many aspects, such as etiology, pathology, diagnosis, treatment, imaging, surgery, microbiology, death and so on, and each aspect is a sub-theme. Western medicine has 83 sub-themes and Chinese medicine has 9 sub-themes. The purpose of using subtitle words is to enhance the specificity of keywords, narrow the search scope and save search time. Not every subtitle can be used with any topic phrase, and there must be a certain logical relationship between keywords and subtitles.

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: Briefly describe what important role retrieval language plays in information retrieval. Retrieval language plays an extremely important role in information retrieval. It is a bridge between information storage and information retrieval. In the process of information storage, it is used to describe the content and external characteristics of information, thus forming a retrieval logo; In the process of retrieval, it is used to describe the retrieval problem, thus forming a question mark; When the question mark and the search mark completely or partially match, the result is a hit to the document.

Question 4: What is information retrieval? 23. Information retrieval technology: 1, Boolean logic retrieval.

2. Cut-off word retrieval

3. Location retrieval

4. Limited domain retrieval

24. Information retrieval approach: 1, classification approach

2. Thematic teaching method

3, keyword method

4, the author's way

5. Title mode

6. Numbering method ..

Question 5: What is the concept of retrieval language? Structured query language

Question 6: 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.