Like Miss Lemmon, the devoted secretary to the famous Belgian detective Hercule Poirot (unforgettable character in the novelist Agatha Christie), he was always turning a perfect file system for storing and locating all his cases, it also tries to create a catalog of ideal library, which allows access to all his works of the easiest and fastest way possible, especially since the libraries are beginning to harbor a considerable number of works in various formats and is offered freely to the public.

The emergence of automated catalogs has greatly facilitated the work of locating documents in libraries, offering multiple points of access to them much more efficient than manual catalog allowed. But the variety of formats that can now be found in the new hybrid libraries, and identification difficult unified representation of these documents and raises questions such as what is the best way to present the same information as is contained in various formats.

One of the most interesting in the catalog design is that of Rahmatollah Fattahi (Ferdowsi University of Mashhad, Iran), who devises a catalog model for hybrid library that focuses on the "content" rather than in " continent. "Fattahi considered to be separate items, or the creation of its physical representation, which can be in print, electronic, sound, audiovisual ... and that is what is usually described in the catalog by bibliographic records for subsequent selection and physical location in the library. The way of linking these two elements, creation and its physical representation, is by creating a dummy record that identifies the item and passes Fattahi called Super Record, dividing into two types, and an author of a work.

The Super Record of an Author is designed especially for highly prolific author, and designed not only to provide a single entry to all works of an author (which already makes any conventional catalog), but also to provide an access point works based on the author.

For instance, under the Super Registration "Miguel de Cervantes Saavedra" would find all his works (individually or grouped in collections) in all its versions (translations), formats, editions, etc.. But all too well works that have been made about him: essays, poems, biographies, bibliographies, web sites ...

In the case of Super Record of a Work, is also designed to work with countless editions and manifestations. Following Cervantes, under the Super Record of his work "The Ingenious Hidalgo Don Quixote de la Mancha" we could find: the complete text, different selections of the same, translations into different languages, adaptations to the theater, cinema or musical work on this book and all in different physical formats, different publications or different editions of the same publisher.

Under the Super unified registry entry we have at our disposal all the information that the library has about an author or work, giving us a picture of that item and provide important value-added information on it. Then, taking the decisions that best suit our needs for information, through the various links would go into the catalog moving us up to the necessary document, the physical element, represented in a bibliographic record.