FU Berlin, Fachbereich Mathematik und Informatik, Institut für Informatik
Prof. Dr. H. Schweppe lädt ein:
Xcerpt: A Query and Transformation Language
for Web and Semantic Web Applications
Prof. Dr. Francois Bry, Ludwig-Maximilians-Universität München, Institut für Informatik
Xcerpt [Xcerpt1] [Xcerpt2] [Xcerpt3] is an experimental query and transformation language developed at the Institute for Informatics of the University of Munich since 2002. The goal of the Xcerpt project is to investigate ways to ease realizing Web as well as Semantic Web applications. Three main directions for research are currently followed: (1) design of high-order language using which programming web queries is made easier and (2) both, conventional web and "semantic web" queries can conveniently be expressed, (3) conception of an efficient run-time system.
Xcerpt is based on the working hypothesis that a common query language capable of inference to be used for querying both, the conventional web and the semantic web is desirable and possible. This hypothesis makes Xcerpt different from all web as well as semantic web query languages developed so far.
Xcerpt is rule-based. In Xcerpt, queries and the (re-)structuring of answer (also called "constructions") are expressed in terms of patterns instead of path navigations (like in XSLT and XQuery). Pattern queries are evaluated against XML documents using a non-standard form of unification (called "simulation unification" ).
Furthermore, Xcerpt supports so-called rule chaining (with recursion), which makes it suitable even for complex query programs.
The talk will (1) discuss Xceprpt's principles, (2) give a practical introduction into the language guided by many examples and > (3) outline related projects.
Ort: Takustr. 9, SR 049 Zeit: Fr,
26.11.2004, 14 Uhr c.t., Kaffee/Tee ab 13.45 im Raum 137
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