Each EPUB should have structured bibliographic metadata associated with it. This can be expressed in the package metadata within the EPUB (the OPF or equivalent), or as a separate file stored adjacent to the EPUB—this may be generated during export e.g. ONIX, JATS, Dublin Core. In order to process metadata at scale, the file naming convention, location of the file relative to the EPUB, and format should all remain consistent.
These guidelines relate to bibliographic metadata for other formats:
21. Provide structured bibliographic metadata with exported publications
45. Embed bibliographic metadata in the <head> of a web-based publication