defined in ontologies. Ontologies are built for various purposes, but all of them express
perceived relations between concepts, and consequently they can provide useful models
for information retrieval purposes. Therefore, we will explore the possibilities to
connect domain terminology (encoded in ontologies) to the actual terminology used on
the Web (recall Table 1.1). The underlying idea is that terms in a particular domain can
be associated with ontology concepts that reflect both the semantic and linguistic
neighbourhoods of the concepts.