| Summary: | 博士 === 國立交通大學 === 資訊科學系 === 89 === With the advances of the Internet and the World Wide Web (for short WWW), there are more and more information published on it. Finding information on the Web and the Internet becomes a difficult task because of the Web’s tremendous size and a variety of kinds of information sources. An integrated access to multiple, distributed, heterogeneous, autonomous databases or information sources is therefore a significant topic in the development of large-scale software.
In this dissertation, we are proposing a uniform interface for Information Retrieval and Gathering on the approved standard of distributed object-oriented environment, OMG’s CORBA. The unified interface will offer a programming interface for retrieving of what applications want, and applying agent technology to implement the infrastructure of IIG (Integrated Information Gathering). In addition, each type of information source has its own query language, schema, and attribute. It is necessary to support an extensible environment in this approach while integrating various information sources in the future. We want to propose an extensible environment, which can permit the source providers to define their own query interface and schema in a well-known object model and language. We apply the XML’s (eXtensible Markup Language) DTD to define the schema of information sources, and provide the interface in the IIG for managing metadata. The client is easily initiating the query operation of metadata to get the schema of information sources. Besides, we apply this technology to the applications of meta-search engine, Standardized Information Retrieval technology-Z39.50, etc.
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