Date Added: Jun 2010
Ontologies are useful tool for data integration across heterogeneous data sets and the importance of ontologies is already widespread, yet ontology building is comparatively a less absorbed concept. Ontology specifies a set of vocabulary for a particular problem domain emphasizing on the meaning of terms. The motive of employing ontologies in semantic web directly relates to unabated change in the languages, which are being used to describe a problem. This switch among various languages directly changes the terms used in the definition of problem assuming that the meaning conveyed will be similar to former. However the semantics might change inevitably and the purpose of upgrading a language gets defeated.