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Source Registration and Query Rewriting Applying LAV/GLAV Techniques in a Typed Subject Mediator.
| Author(s): | Briukhov D.O., Kalinichenko L.A., Martynov D.O. |
| Created: | 2007/10/15 |
| Published: | Proc. of the Ninth Russian Conference on Digital Libraries RCDL'2007. -- Pereslavl-Zalesskij: Pereslavl University, 2007. -- P. 253--262. |
| Abstract: | |
| New methods and tools for application development in collaborative scientific enterprises (like Virtual Observatories (VO)) over multiple distributed sources of data and programs are required. In this paper we focus on results of research and experimental work oriented on problem-driven subject mediation emphasizing aspects of LAV/GLAV information sources integration in the mediator. The approach considered has the following distinguishing features: typed, object canonical model is used instead of usually applied relational one; a technique of refining mapping of source information models into extensible canonical one is provided; registration in a mediator of a relevant source is done so that a mediator type should be provably refined by a relevant source type or by a composition of such types (the conflict resolving functions are to be specified, if required); rewriting of non-recursive logical programs containing strongly typed rules is applied. These features provide methodological context for the current paper that is focused on description of the role the LAV/GLAV approach plays in the mediator. Using astronomical example taken from the Russian VO context, we show the technique of information source registration at the mediator and query rewriting technique in a typed specification environment applying LAV/GLAV approach. |
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