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Scomposizione delle faccette e ruolo del contesto

Una questione cruciale nella classificazione a faccette riguarda proprio la scomposizione dell’elemento da classificare: in base a quale criterio si scelgono le proprietà da usare come faccette? E ancora, come si scelgono i valori di ciascuna faccetta?

A porre per primo la questione è Cory Preus che si chiede quale criterio adottare per scomporre le faccette di primo livello (nel caso di un vino, ad es.: colore; origine; vitigno etc.) in isolates (o foci o topic o faccette di secondo livello – a seconda della terminologia preferita).

What methodology did you use to define these isolates? To me, they make sense… they feel right. Unfortunately, that doesn’t agree with the folks who ultimately sign off on it.

In Ranganathan’s scheme of classification, he suggests that there are five fundamental categories: personality (distinguishing characteristic), matter (physical material), energy (action), space (location), time (time period).

Now one question I’ve always had is whether one should look at these categories and find the facets that naturally make sense within them (Cory Preus, 18 dicembre 2002).

La questione è di quelle da un milione di dollari (cf. Kathryn La Barre). Nessun criterio aprioristico può indicarci la soluzione. Viceversa, essa va ricercata nel contesto, nell’analisi della domanda, delle esigenze del pubblico cui quei contenuti sono destinati. Solo tale contesto potrà fornirci indicazioni sul modo migliore in cui sezionare le nostre faccette primarie in faccette di secondo livello (o topic o subject).

> What methodology did you use to define these isolates? To me, they make
> sense… they feel right. Unfortunately, that doesn’t agree with the folks
> who ultimately sign off on it.

Ah, the thousand dollar question. I didn’t do several things and answered your question on the fly, it was an attempt at dividing the ingredient facet into logical areas. NOTE: there is not one right way to do this. That is why context is so vitally important. (And another quite long answer to your questions follows).

The methodology should include an approach in which you are able to identify your universe of entities, it is best when beginning facet analysis to work within a bounded universe. I give students in my class a bag of marbles. Who is your user group? Why do they want this
ordering/access system? What will they be using it for? Collectors who want to purchase marbles? Kids who want to play with them? Artists who want to illustrate a book about them? These considerations will affect your facets.

At Epircurious we are dealing with recipes-so the best approach to conducting facet analysis is to get a good sense of the domain area. (This is one stepwhich I did not do, but rather relied on my own knowledge of cooking and recipes – something I would NOT recommend that you do if conducting facet analysis.) Here I’d recommend working with several comprehensive cookbooks in order to get a sense of how the domain is structured. For web design with a site like epicurious, you’d also be laboring (I assume) with knowledge of who is supporting the site (or who would be potential advertisers) and who your potential audience might be. Next step would be to take a look at a good glossary of cooking terms, and to familiarize yourself with a number of recipes themselves. Each step, examination of the cookbooks, the terms used in a glossary and the recipes themselves brings to light the detailed structures of the domain
(Kathryn La Barre, 18 dicembre 2002).