In the context of the Semantic Web, many possible executing queries wouldn't retrieve any resources. This is because the viewpoints of ontology designers, annotation designers, and users performing a Web search don't always match, leading to missed answers. Approximate query processing is thus of prime importance for efficiently searching the Semantic Web. The Corese ontology-based search engine handles RDF Schema, part of and OWL Lite and RDF metadata, and can process approximate queries.
This article is part of a special issue on AI, Agents, and the Web.