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The IMPrECISE system is a probabilistic XML database system which supports near-automatic integration of XML documents. What is required of the user is to configure the system with a few simple knowledge rules allowing the system to sufficiently eliminate nonsense possibilities. We demonstrate the integration process under conditions with varying degrees of confusion and different sets of rules. Even when an integrated document still contains much uncertainty, it can be queried effectively. The system produces a sequence of possible result elements ranked by likelihood. User feedback on query results further reduces uncertainty which in a sense continues the semantic integration process incrementally. We demonstrate querying on integrated documents and measure answer quality with adapted precision and recall measures. The user feedback mechanism has not been implemented, hence cannot be demonstrated yet. IMPrECISE has been implemented as an XQuery module for the XML DBMS MonetDB/XQuery. Therefore, the demo also illustrates the power of this XML DBMS and of XQuery as both a query and programming language.

This executive summary provides a brief overview of the topic, the organization, and the outcome of the Dagstuhl Seminar on Uncertainty Management in Information Systems.

The results of the probabilistic database benchmark working group.

A pronounced heterogeneity of purified acid phosphatase has been observed. The size heterogeneity which was demonstrated by electrophoretic methods is in agreement with the finding that the enzyme preparation contains families of molecules differing in the carbohydrate content (38% - 70%). The charge heterogeneity was shown by isoelectric focusing indicating the existence of several slightly different protein chains in the enzyme preparation. It was found that the enzyme is a dimer with a mean molecular weight of 252000 Daltons. There are 16 N-glycosidically linked carbohydrate chains, differing in size from 15-150 mannose units, and a very small amount of O-glycosidically linked mannose. Properties of acid phosphatase deglycosilated by treatment with beta-endo-N-acetylglucosaminidase, were compared with the native enzyme and it was found that the carbohydrate chains do not play a direct role in the catalytic activity of the enzyme, but stabilize the tridimensional structure of the molecule. A drastic increase of sensitivity of the deglycosilated enzyme against proteolysis was found.

Dienstorientierte Architekturen werden ihr volles Potenzial nur dann entfalten können, wenn es gelingt, Dienste fallweise und zur Laufzeit einzubinden. Hierdurch entstünde eine weitaus robustere und besser an den Kontext angepasste Architektur, da ungeeignete Dienstgeber dynamisch ausgetauscht werden könnten. Ziel der Arbeit war daher die Schaffung einer semantischen Dienstbeschreibungssprache, die als Grundlage für eine solche Dienstnutzung dienen kann.