Ofrece esta API para uso libre (incluso comercial), para anotar semánticamente (RDF) y de anera automática los textos (C&P): The Calais Web service enables publishers, bloggers and sites of all kinds to automatically metatag the people, places, facts and events in their content to increase its search relevance and accessibility on the _Web.
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etiquetas: web semántica , metadatos , anotación , opencalais 
