What are the classification methods of literature resources in literature retrieval? What are the perspectives of document processing?

1. Oral information resources are information resources expressed by human beings in oral language but not recorded. They are directly consumed by "information recipients" on specific occasions, and can be passed down from generation to generation and used by more people. For example, activities such as talking, chatting, giving lectures, giving speeches, discussing and singing are all centered on the exchange and utilization of oral information resources.

2. Literature information resources are information resources recorded on specific carriers in the form of language, characters, data, images and audio-visual. Its main feature is that it has a material carrier that is not attached to people. As long as these carriers are not destroyed or disappeared, literature information resources can be used infinitely by human beings across time and space.

3. Body language information resources are information resources expressed by gestures, expressions and gestures. They are usually associated with a specific cultural background. For example, dance is a typical body language information resource.

4. Physical information resources are information resources expressed in physical form by human beings through creative labor. There are many material components in this kind of information resources, which are sometimes difficult to distinguish from material resources and generally have poor transferability; Common physical information resources include product samples, models, inscriptions and sculptures.

5. According to the recording methods and carrier materials, literature information resources can be divided into five categories: text type, printing type, miniature type, machine-readable type and audio-visual type. Written literature information resources are generally based on paper and recorded by manual copying, including manuscripts, letters, diaries, original files, etc. The printed literature information resources are mainly paper, and the recording methods are mainly printing technology, including mimeograph, lead printing, offset printing, woodcut, photocopying and laser printing. Micro-document information resources are based on photosensitive materials, and the recording method is mainly optical recording technology. The main types are microfilm, microfilm and microfilm. Machine-readable literature information resources take magnetic materials as carriers, and the recording method is magnetic recording technology. The main types are magnetic tape, floppy disk and CD.

6. Audio-visual literature information resources take photosensitive materials and magnetic materials as carriers, and the recording methods include optical recording technology and magnetic recording technology. The main types are records, audio and video tapes, film, films and slides.

7. Printed literature information resources can also be divided into books, periodicals, conference materials, research reports, patent specifications, government publications, dissertations, product specifications, documents, standards, news newspapers, statistical reports, maps, etc. According to different publishing forms.