By Georg Lausen, Dan Suciu
ISBN-10: 3540208968
ISBN-13: 9783540208969
The papers during this quantity characterize the technical application of the ninth Biennial WorkshoponDataBasesandProgrammingLanguages(DBPL2003),whichwas hung on September 6-8, 2003, in Potsdam, Germany. The workshop meets each years, and is a well-established discussion board for ideas that lie on the intersection of database and programming language learn. DBPL 2003 persevered the t- dition of excellence initiated by way of its predecessors in Rosco?, Finistre (1987), S- ishan, Oregon (1989), Nafplion, Argolida (1991), long island, manhattan (1993), Gubbio, Umbria (1995), Estes Park, Colorado (1997), Kinloch Rannoch, Sc- land (1999), and Frascati, Rome (2001). Theprogramcommitteeselected14papersoutof22submissions,andinvited twocontributions.The16talkswerepresentedoverthreedays,insevensessions. In theinvitedtalk Jennifer Widom awarded the paper CQL: a Language forContinuousQueriesoverStreamsandRelations,coauthoredbyArvindArasu andShivnathBabu.Whilealotofresearchhasbeendonerecentlyonqueryp- cessingoverdatastreams,CQLisvirtuallythe?rstproposalofaquerylanguage on streams that could be a strict extension of SQL. The language is based round an easy but robust proposal: it has certain information forms, family members and streams, with well-de?ned operators for mapping among them. Window speci?cation expressions, similar to sliding home windows, map streams to relatives, whereas operators akin to ’’insert stream,’’ ’’delete stream,’’ and ’’relation stream’’ map family to streams by way of returning, at every one second in time, the newly inserted tuples, the deleted tuples, or a image of the total relation. the various examples during this paper make a powerful case for the ability and usability of CQL
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Additional resources for Database Programming Languages: 9th International Workshop, DBPL 2003, Potsdam, Germany, September 6-8, 2003, Revised Papers
Example text
Child::a/child::*/parent::b This path requires that the node in the result has name a and b. 3. /child::*/parent::*/parent::* This path looks for a parent of the root node, which cannot exist. 4. /preceding::* This path looks for a node that precedes the root, but such a node cannot exist since the root is always the first node in the document order. The organization of this paper is as follows. The next section contains the definition of XPath expressions and their semantics. Section 3 introduces the notion of tree description graph which are a special case of partial tree descriptions G.
We then proceed with constructing the patterns that ensure that the truth assignment for variable in is equal to that in Because the length of these two patterns is there are only two ways in which it can be matched with a string of length Finally we define the patterns that ensure that the encoded truth assignment make a certain clause satisfied. For this purpose we define as equal to except that the pair is equal 10 if and equal to 01 if We then construct the patterns that ensure that the clause is made satisfied by the truth assignment for as follows.
2. G. Gottlob, C. Koch, and R. Pichler. “The Complexity of XPath Query Processing”. In Proceedings of the 22nd ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems (PODS’03), San Diego, California, 2003. 3. G. Gottlob, C. Koch, and R. Pichler. “XPath Query Evaluation: Improving Time and Space Efficiency”. In Proceedings of the 19th IEEE International Conference on Data Engineering (ICDE’03), Bangalore, India, Mar. 2003. 4. World Wide Web Consortium. XML Path Language (XPath) Recommendation.
Database Programming Languages: 9th International Workshop, DBPL 2003, Potsdam, Germany, September 6-8, 2003, Revised Papers by Georg Lausen, Dan Suciu
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