Abstract
Ontologies apply to many applications in recent years, especially on the semantic web, information retrieval, information extraction, and question answering. The purpose of domain-specific ontology is to get rid of conceptual and terminological confusion. It accomplishes this by specifying a set of generic concepts that characterizes the domain as well as their definitions and interrelationships. There are some languages in order to represent ontologies, such as RDF, OWL. However, these languages are only suitable with ontologies having a small data. It usually uses a database for representing ontologies having big data. However, most of the databases do not sufficiently support the semantic orientated search by Structured Query Language (SQL). Therefore, this paper introduces an approach for semantic-based keyword search over relational databases. This approach can be applied to any relational database system.
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