For example, document doiNo.10.3969/J.ISSN.0517-66110/5.6438+03.002. That is, the structure of doi is 10.3969/j.issn.xxxx.yyyy.nn.zzz, where10.3969 is the prefix and j. ISSN. xxxx-xxxx. yyyy. nn. zzz is the suffix.

(1)j represents periodicity;

(2)issn.xxxx-xxxx means that the serial number of a periodical is xxxx-xxxx;

(3)yyyy indicates the edition year;

(4) 4) The meaning of NN is the issue number;

(5) 5) The meaning of zzz is the serial number of the papers in the same semester (that is, the first few articles).

If the periodical has no ISSN number, the doi code uses CN number, and its doi structure is: 10.3969/j.cn.xxxx-xx (r). Yyyy.nn.zzz. (r) stands for the classification number in the CN number.

Function of doi

1. It can give digital resources a unique symbol of lifelong globalization.

2. Linking to digital resources through DOI is durable and convenient. For readers, just click the DOI number of the article to find the full text of the article, and this link is permanently maintained, which completely solves the problem of link positioning of the full text.

3. Exchange information among various systems through DOI, and expand applications.

4. Establish a community of publishers, service providers, libraries and researchers to achieve a win-win situation for the industry.

5. Obtain data sets and metadata information through existing directories.

6. Conduct international exchanges.

7. Convenient combination with paper.

8. It is convenient for data reuse and verification.