Controlled vocabularies, taxonomies and thesauri have been in use in a wide variety of organizations for decades. With the information explosion fueled by the internet, the importance of these organization structures has become more and more apparent. The problem isn’t where to find vocabularies or how to build them; on the contrary, enterprises typically find that they have several mini-vocabularies, each tuned to a special purpose or business need, just as so-called "folksonomies" have appeared in popular websites. The problem enterprises are facing today is how to manage all these vocabularies in a coherent way and eventually to integrate them so that they can make cross-references from one to another.

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