Guidelines are documents of an undefined type among documents. Documents are divided into: "journal articles, monographs, proceedings, dissertations, international and national standards, patents, electronic documents, and undefined types of documents."
The guide belongs to three types of documents.
Tertiary documents refer to the product of comprehensive and generalization after extensive and in-depth analysis and research of relevant primary documents and secondary documents. People often refer to this type of documents as the results of "intelligence research".
It mainly includes reviews, topic reviews, subject annual summaries, progress reports, data manuals, progressive publications, and literature guides.