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.