FaceTag is a working prototype of a semantic collaborative tagging tool conceived for bookmarking information architecture resources. It aims to show how the widespread homogeneous and flat keywords' space created by users while tagging can be effectively mixed with a richer faceted classification scheme to improve the �information scent� and �berrypicking� capabilities of the system. The additional semantic structure is aggregated both implicitly observing user behaviour and explicitly introducing a compelling user experience that facilitates the end-user creation of relationships between tags. FaceTag current implementation is written in PHP / SQL and includes an open API which allows querying and integration from other applications.

1. Face T ag Integrating Bottom-up and Top-down Classification in a Social Tagging System Emanuele Quintarelli, Andrea Resmini, Luca Rosati EuroIA 2006, Berlin

2. The Evolution of Collaborative Tagging

16. Faceted Analysis

19. How we chose facets from the CRG general scheme Document Date Time [Country] Space People, companies Agent Target (e.g. Industry, Health...) Patient -- Byproduct [Deliverables] Product Activities (e.g. competitive analysis, classification) Operation -- Process [Format] Material Language Property -- Part Resources Type (e.g. case study, report...) Type [Documents, resources] Thing FaceTag facets CRG standard categories

22. Open Issues

23. Title Topic Activity Geo. Area Other What's “faceted” Year Author Other Metadata Formal properties Facets Semantic properties

25. Technology Preview: Face T ag

26. Main page Facets and pertaining tags Search box with hinting Resources with pertaining tags

27. Using facets for searching: engaging 1 tag The user chooses 'intranet design' and facets and tags adjust. Breadcrumbing for the engaged tag appears (top).

28. Using facets for searching: intersecting 2 tags The user adds 'article' from another facet.Facets and tags adjust again. Breadcrumbing reflects the changes. Tags can be disengaged individually

29. Using facets for searching: final result set 1 2 3 The user adds 'shiv singh' from yet another facet and finds a final result set. Facets and tags adjust and show that there is no further possibility to zoom in. Breadcrumbing lists all engaged tags ready to be disengaged.