Including the title, abstract, indexing subject words and classification number of the paper, and further processing; Whether there are subject words and classification numbers is the only sign to judge whether the papers are formally included in the Compendex database (conference papers enter the Compendex database).

Compendex mainly includes: title); Paper; Author; The affiliation of the first author; English abstract; Serial title); The name of the journal where the paper is located; Volume problem; Number of pages); Thesis; Classification code (EI classification code); Keywords (ei main title); Ei control clause; Uncontrolled terms and so on. In which: classification code; Keywords (ei main title); Ei control clause; Uncontrolled terms need to be given separately by professionals.

The first page of EI is an expanded version of EI, just a bibliography. Generally, the abstract is not entered, and the subject words and classification numbers are not indexed. Some first pages also have abstracts, but the subject words and classification numbers are not indexed. With the abstract, it is not necessarily a formal entry in the Compendex database.

The first page of Ei mainly includes: title); Paper; Author; Serial title); The name of the journal where the paper is located; Volume problem; Number of pages); Thesis; Some data have English abstracts and first author relationships. Do not need any professionals to do more work.