Document retrieval approach
(1) Author approach: Many retrieval systems have author indexes and institutional (institutional authors or author’s institution) indexes, and patent document retrieval systems have patentees. Indexes, and the method of using these indexes to search alphabetically from the names of authors, editors, translators, patentees, or names of institutions and organizations is collectively referred to as the author route.
(2) Titles include book titles, journal titles, article titles, etc.: Some retrieval systems provide ways to search by title order, such as book title catalogs and journal title catalogs.
(3) Classification approach: Retrieve documents according to the subject classification system. This approach is classified and sorted with the knowledge system as the center. Therefore, it can better reflect the systematic nature of the discipline, reflect the affiliation, derivation and parallel relationship between the discipline and things, facilitate the search for literature materials from the scope of the discipline, and can play a role The effect of "bypassing".
Zero document
Refers to a form of document that has not been formally published or has not formed a formal carrier. Such as: letters, manuscripts, meeting minutes, notes, etc.
Characteristics: objectivity, fragmentation, and immaturity. It is generally obtained through oral conversations, visiting exhibitions, participating in lectures, etc. It not only has a certain value in content, but also can make up for the shortcomings of general public documents that take a lot of time from the objective formation of information to public dissemination.
It refers to original documents without any processing, such as experimental records, manuscripts, original audio recordings, original videos, conversation records, etc. Zero-time documents play an important role in the preservation of original documents, verification of original data, and verification of original ideas (right holders).