In this paper we present an approach to user modeling based on the domain model that we generate automatically by resource (text) content processing and analysis of associated tags from a social annotation service. User's interests are modeled by overlaying the domain model -via keywords extracted from resource's (text) content, and tags assigned by the user or other (similar) users. The user model is derived automatically. We combine content-and tag-based approaches, shifting our approach

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... d flat "folksonomical" representation of user interests to involve relationships between both keywords and tags.