The meaning of document doi number is as follows:
DOI stands for DigitalObject Unique Identifier, which refers to the unique identifier of a digital object. It can be understood as the unique "ID card number" of digital resources. It can be used DOI identifies digital resources such as documents, videos, reports, or books.
At present, most academic documents (mainly documents after 2000) have exclusive DOIs. As long as you know the DOI of a document, you can query the author, title, journal, and Official links and other information. Therefore, as long as you enter the DOI of the document in the official account, the server can quickly find the document you need to download and return the download link.
The numbers and English behind doi are the unique identifiers of journals and articles, which are generally compiled by the journal when applying for articles to be included in the database. The article uses the issue volume number and page number as important information. The information in the doi number has no practical significance. DOI is a mathematical object identifier, commonly known as the retrieved number. After the article is published, it will take several years, several issues, several editions, and as many pages as your article. It will then be searched by SCI, EI, etc., and you will be given a search number.
What follows the Journal is the year, issue (edition): page number. A doi consists of two parts: prefix and suffix, separated by "/". The prefix consists of two parts. One is the directory code. The directories of all doi are "10", that is, all dio codes start with "10". The other is the registration organization code. Any organization or unit that wants to register doi can apply to IDF for the registration organization code.
Classification of documents
According to publication type, it is divided into books, journals, conference documents, scientific and technological reports, government publications, patent documents, technical standards, dissertations, product information, and technical files. . According to the type of carrier, it can be divided into written type, printed type, miniature type, audition type and electronic document.
According to the processing depth and content nature of the document content, it is divided into primary documents, secondary documents, tertiary documents and zero documents. Literature records countless useful facts, data, theories, and methods.
The document classification is expressed in the form of a classification table, so it is customary to equate the classification method and the classification table with the same concept. But in fact there is a difference between the two, that is, the document classification is not simply a classification table and the description of the table, but also includes the practice of classification.
There are many kinds of classification methods, the common ones are: level classification method, title classification method, group classification method (or colon classification method), binary classification method, decimal classification method, word classification method Sequential classification, natural classification, artificial classification, subject classification, etc.