A semantically annotated resource is any kind of good, tangible or intangible (e.g. a document, a image, a product, a service) endowed of a description that refers to a shared ontology.

In this talk we present services that aim at fully exploiting the semantic annotation, to provide principled approximated resource retrieval. We introduce and motivate, in particular, services - based on the formal semantics of Description Logics languages - for resource ranking and/or composition using Concept Contraction and Concept Abduction.

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