: The file format, traditionally used for Amazon Kindle devices.

: A unique catalog or ID number within a specific database.

: Likely the source repository, website, or collection name. 1103 : Possibly a volume number, date code, or sub-category.

Based on the identifier provided, appears to be a specific ebook filename or a database entry for a digital book file, likely from a specialized Spanish-language digital library or archive (as suggested by the name "Pelibrolandi").