In [1], author presents a system for semantic search
based on ontology that provides the domain
knowledge. But retrieval performance is not
shown. In [2], author proposed a concept based
technique utilizing a personalized ontology and
spatial ontology. In [3], author proposed a system
that is based on ontology for accessing
heterogeneous data of cultural heritage. In [4],
author proposed a hybrid system that is based on
ontology and can find images through keywords