Research Of Access Mechanism Of Unstructured Information Based On Ontology

Along with the fast development of the Network technology, information on the Network increases rapidly at the speed of exponential, and most information now presents as unstructured form such as emails, graphics, Web pages, workflows etc. instead of traditional structured form. How to utilize a uniform method to express and access this unstructured information, then acquire knowledge from it is each organization's information construct kernel and also is a new research direction at present.As a new standard for data express and exchange, XML has a uniform describing mechanism for unstructured information. But the shortage of semantic expression for XML restricts information show, exchange and share in the different environments. Fortunately, Ontology technique brings concept model in the domain knowledge to resolve XML semantic difference problems, reduce or eliminate confusion for concepts and terms, so as to get those hidden or ambiguous information becomes realization. There are adding really abundant semantic background knowledge for unstructured information based on XML with ontology.Supported by the relative theories above-mentioned, this thesis provides a uniform accessing strategy and realizing scheme based on ontology as access mechanism research for unstructured information. Mainly includes techniques and theories as follows:1. Combines Frame-Logic and SQL language's characteristics, bring forward a new type language (Fl-Plus) to support each data operation;2. Designs and realizes the inference engine concisely, in order to complete the parse mapping for logic inferential rules and semantic dictionary and to realize the kernel technique for semantic level information access, inference engine helps computer distinguish semantic from XML documents and complete intelligent access;3. Pattern restriction information based on schema can restrict all kinds of access operations, and hope to guarantee bottom data's validity as furthest as possible;4. Aim at the bottleneck problem in applications that is deal with XML, this thesis combines three techniques such as path optimizing, ontology set access and creating buffer based on JDOM to improve system performance at a certain extent;5. Using JDBC for reference, designing JXSC service interface provides support for three levels model access way.Finally, guided by the techniques and theories above-mentioned, this thesis brings forward the model during the project-Research of Web Storage Based on XML, which staked by the Hubei Provincial Department of Education organically, and primarily realizes the OBSA-AM (Ontology-based Storage Architecture - Access Mechanism) during the research by using JAVA and XML techniques.