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Abstract:

For a long period of time the research activities in information retrieval have mainly addressed flat text files. Although there have been approaches towards multimedia data and structured data in the past, these topics gain increasing interest today in the context of XML data. To address structured multimedia data, an efficient combination of contentbased retrieval for multimedia data, retrieval in meta data and mechanisms which allow to exploit the document structure is needed. To this end, we propose IRstream as a general purpose retrieval service for structured multimedia documents. IR-Stream is intended as a powerful framework to search for components of arbitrary granularity – ranging from single media objects to complete documents. At this, IRstream combines traditional text retrieval techniques with contentbased retrieval for other media types and fact retrieval on meta data. In contrast to other retrieval services which permit set-oriented or navigation-oriented access to the documents, we argue for a stream-oriented approach. We describe the significant features of this approach and point out the system architecture. Furthermore, we present the application of IRstream as a retrieval system for XML documents in the context of INEX. 1.

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