【About Indexing and Abstracting】
Publisher sends all of its published materials to the indexing services. But please note that CNKI, Airiti Library, Google Scholar, DBLP, Scopus, Engineering Village, EI Compendex, CPCI(Web of Science), etc., are all entirely separate entities from Publisher. As such, we cannot guarantee that a certain proceedings volume content will pass their review process – or, even if it does pass the review process, when exactly that volume will be indexed. They all have their own guidelines for acceptance, independent of Publisher's influence.
About Ei Compendx: There is no guarantee that publications evaluated, reviewed, or meeting all of the criteria above will ultimately be selected for coverage, as other extenuating or internal factors may prevail (by Elsevier - Ei Compendex).
About Scopus: Scopus covers only full-text conference papers, and currently there are close to 8 million conference papers from nearly 100,000 conference events included in the database. Conference paper selection is done based on the relevancy and quality of the conference in relation to the subject field. Priority is given to conference materials published by reputable organizations and publishers in relevant subject fields. (by Elsevier - Scopus).
About CPCI/WOS: From this vast body of literature Web of Science selects for coverage in its Conference Proceedings Citation Index (CPCI) only those publications which will be of greatest importance to the largest number of researchers and scientists worldwide. Each year many thousands of proceedings volumes are submitted to Web of Science for evaluation. From these, the most important and influential are selected for coverage (by Clarivate - Web of Science).