Network information classification and document classification are two basic methods of information organization at present. For a long time, the traditional literature classification has played a great role in organizing information resources, establishing classified retrieval tools, classified statistics and so on. The appearance of network environment and the development of computer technology have changed the processing objects and means of classification. Under this environment, a new classification tool-network classification came into being. The obvious difference between the traditional literature classification system and the network information classification system in knowledge system is that the former follows the knowledge system of the traditional classification system, while the latter designs a new knowledge system according to the present situation of the network information environment.
The specific performance is as follows:
1, classification of categories
The traditional document classification system is generally based on disciplines, and the documents related to disciplines are concentrated under disciplines. The basic categories of China Library Classification are divided into 22 basic categories on the basis of five categories according to the needs of scientific classification and literature classification. Network classification is to organize the classification system with the theme as the center or the combination of theme and theme. Taobao is a representative of the combination of disciplines and disciplines, and has established a thing-centered classification system. Taobao * * * has 15 basic categories, namely: virtual, clothing, shoes and bags, outdoor sports, jewelry and clocks, digital, home appliances, beauty salons, maternal and child products, furniture and building materials, food specialties, daily necessities, automobiles, cultural interests and local life. 2. Category Settings
The category setting of traditional literature classification mainly adopts the method of conceptual logic to divide categories, and each division uses a classification standard, which is carried out step by step and expanded layer by layer. It pays more attention to the logic and systematicness of category setting, which is comprehensive and balanced among different categories. China Library Classification is divided into basic disciplines and internationally accepted majors on the basis of considering the balance of various disciplines. However, due to the diversity of network information, users and their information needs, a single logical division can not meet the needs of network information organization and retrieval. Therefore, "multi-category" has become an important method to set up network classification categories. Among them, the category in the form of network resources has been added in the category setting, and the level of categories has been greatly adjusted according to the distribution of resources and the needs of most users. Such as "sportswear" and "sports shoes", these class names are only a small branch in Chinese Library Classification, but they are regarded as secondary categories in the navigation bar of Taobao. This is because it is concentrated in network information resources and has a large demand for users, so it is often set as a basic category; On the other hand, some special resources of natural science and applied technology concentrated in traditional literature units are set as key categories. Due to the relatively small number of network resources and the influence of users' needs, most general classified search engines only set general categories, which shows different characteristics from traditional literature classification in category setting and organization.
3. Expansion of categories
Due to the need of organizing documents and the influence of traditional manual use environment, the traditional document classification system basically adopts linear sequence. In the classification system of China Library Classification, there are four types of relationships: subordination, juxtaposition, alternation and correlation. Subordination and juxtaposition reveal the main clues of the development of category system and reflect the vertical relationship of categories; Alternating categories and category references complement the main relationships displayed by the category system, revealing the horizontal relationships scattered by the category system. Through the combination of the two, the document classification system has established a crisscross, rigorous and practical classification system according to the relationship between categories. In the network information classification system, the ranking of different levels of categories is expressed by hypertext links, and the categories of the same level are arranged according to word order or hot degree.
4. Different treatments of category cross-relations.
The treatment of category cross relationship refers to the disclosure and reflection of categories involving multiple disciplines or categories involving multiple themes under different disciplines or themes. The network information classification system adopts the method of category repetition reflection to deal with the cross relationship of categories, that is, the topics involving multiple disciplines are repeatedly set under multiple categories. For example, in Taobao, there are two secondary categories, namely "women's clothes" and "summer clothes", but there are "women's clothes" in "summer clothes" and "summer clothes" in "women's clothes". There are three ways to deal with the cross relationship of categories in traditional literature classification: one is to set alternate categories. For disciplines or categories related to two disciplines and belonging to two scientific departments, one category is set as a formal category, and the other category is set as an alternative category. The second is to take notes. The general sum sub-theory of a kind of things is generally expressed as "the general people are here, and the special people are related to various kinds" under the general category, or it shows the relationship between the general sum sub-theory. The third is to set reference items. For two categories with cross relationship, set each other. See.