FAIR principles: the secret of the data wizards.

Books are an inexhaustible source of knowledge and experiences lived by others before us, which we can reuse to move forward in our lives. Libraries, therefore, are places where readers looking for books, borrow them, and once they have used them and extracted from them what they need, return them. It is curious to imagine the reasons why a reader needs to find a particular book on a particular subject.

 In case there are several books that meet the required characteristics, what might be the criteria that weigh most heavily in choosing the book that the reader feels best contributes to his or her task. And once the loan period of the book is over, the work of the librarians to bring everything back to an initial state is almost magical.

The process of putting books back on the shelves can be repeated indefinitely. Both on those huge shelves that are publicly available to all readers in the halls, and on those smaller shelves, out of sight, where books that for some reason cannot be made publicly available rest in custody. This process has been going on for centuries since man began to write and to share his knowledge among contemporaries and between generations.

In a sense, data are like books. And data repositories are like libraries: in our daily lives, both professionally and personally, we need data that are on the "shelves" of numerous "libraries". Some, which are open, very few still, can be used; others are restricted, and we need permissions to use them.

In any case, they contribute to the development of personal and professional projects; and so, we are understanding that data is the pillar of the new data economy, just as books have been the pillar of knowledge for thousands of years.

As with libraries, in order to choose and use the most appropriate data for our tasks, we need "data librarians to work their magic" to arrange everything in such a way that it is easy to find, access, interoperate and reuse data. That is the secret of the "data wizards": something they warily call FAIR principles so that the rest of us humans cannot discover them. However, it is always possible to give some clues, so that we can make better use of their magic:

• It must be easy to find the data. This is where the "F" in the FAIR principles comes from, from "findable". For this, it is important that the data is sufficiently described by an adequate collection of metadata, so that it can be easily searched. In the same way that libraries have a shingle to label books, data needs its own label. The "data wizards" have to find ways to write the tags so that the books are easy to locate, on the one hand, and provide tools (such as search engines) so that users can search for them, on the other. Users, for our part, have to know and know how to interpret what the different book tags mean, and know how the search tools work (it is impossible not to remember here the protagonists of Dan Brown's "Angels and Demons" searching in the Vatican Library).
• Once you have located the data you intend to use, it must be easy to access and use. This is the A in FAIR's "accessible". Just as you have to become a member and get a library card to borrow a book from a library, the same applies to data: you have to get a licence to access the data. In this sense, it would be ideal to be able to access any book without having any kind of prior lock-in, as is the case with open data licensed under CC BY 4.0 or equivalent. But being a member of the "data library" does not necessarily give you access to the entire library. Perhaps for certain data resting on those shelves guarded out of reach of all eyes, you may need certain permissions (it is impossible not to remember here Umberto Eco's "The Name of the Rose").
• It is not enough to be able to access the data, it has to be easy to interoperate with them, understanding their meaning and descriptions. This principle is represented by the "I" for "interoperable" in FAIR. Thus, the "data wizards" have to ensure, by means of the corresponding techniques, that the data are described and can be understood so that they can be used in the users' context of use; although, on many occasions, it will be the users who will have to adapt to be able to operate with the data (impossible not to remember the elvish runes in J.R.R. Tolkien's "The Lord of the Rings").
• Finally, data, like books, has to be reusable to help others again and again to meet their own needs. Hence the "R" for "reusable" in FAIR. To do this, the "data wizards" have to set up mechanisms to ensure that, after use, everything can be returned to that initial state, which will be the starting point from which others will begin their own journeys.