Unstructured information organization based on ontology

This paper proposes the method to develop domain ontology's DB, based on the ontology's DB, utilizes ontology's to annotate unstructured information and translate unstructured information into structured information, so that facilitates the retrieval of unstructured information. The experiment results show that rule-based retrieval has better recall and shorter retrieval time than fact-based retrieval and relationship -based retrieval.