Ontology based digital library

In this paper, we describe the use of ontology for efficient searching in digital library. A digital library is a repository of digital documents of different files formats like.pdf, .doc, .ppt or even plain .txt which can be any books, magazines, instruction manuals, presentations etc. Ontology based digital library would have the additional features of semantic based accessing / querying and searching the library using a reference ontology to reform the user query and extract only appropriate content from the library.