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Database Programming Languages: 11th International by Wenfei Fan (auth.), Marcelo Arenas, Michael I. Schwartzbach

By Wenfei Fan (auth.), Marcelo Arenas, Michael I. Schwartzbach (eds.)

This quantity comprises the court cases of the eleventh foreign Symposium on Database Programming Languages (DBPL 2007), held in Vienna, Austria, on September 23–24, 2007. DBPL 2007 was once one among 15 conferences co-located with VLDB (the overseas convention on Very huge facts Bases). DBPLcontinues to presentthe verybest workat the intersectionof database and programming language study. The complaints contain a paper in line with the invited speak via Wenfei Fan and the sixteen contributed papers that have been chosen by means of the programcommittee from forty-one submissions. each submission used to be reviewed via at the very least 3 individuals of this system committee. additionally, this system committee sought the evaluations of extra referees, chosen as a result of their services on specific themes. The ?nal number of papers used to be made over the past week of July. we want to thank all the authors who submitted papers to the c- ference, and the participants of this system committee for his or her very good paintings. this system committee didn't meet in individual, yet conducted huge d- cussions throughout the digital computing device assembly. we're thankful to Andrei Voronkov for his EasyChair process that made it really easy to control those discussions. eventually, we'd additionally prefer to thank Christoph Koch and Gavin Bierman for his or her counsel and sound counsel, and the organizers of VLDB 2007 for taking good care of the neighborhood association of DBPL.

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Additional resources for Database Programming Languages: 11th International Symposium, DBPL 2007, Vienna, Austria, September 23-24, 2007, Revised Selected Papers

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To denote variables and upper-case bold letters to denote sets of variables X, Y, Z. , ‘Moses’, ‘Isaac’, etc. Terms are either constants or variables and are denoted t, t1 , t2 , etc. An atom a is of the form p(t1 , . . , tn ) where p is a predicate symbol of arity n and each ti is a term. We use pred(a) to denote the predicate of a and we use ar(a) as a shorthand notation for ar(pred(a)). For an atom a, we denote by ti (a) a term which appears at position i. Terms which are mapped to a constant are said to be bound; other terms are free.

In general, it might be possible that q2 and further nodes can be matched in subtree(d2 ). The function call TM(d2 , q2 , q4 ) checks that possibility. ) But q2 is not labeled with a so the return value of the two TM calls is q1 . After this initial phase, HM(d2 , q1 , q5 ) tries to improve qtree and qhedge iteratively. It calls HM(d1 , q2 , q4 ) and improves qhedge to be q2 , because q2 and d1 are both labeled with b. Further improvements fail as there is no c-labeled node in the subhedge of d2 .

Towards a contradiction, assume that there is an u such that D |=u Q, but u was not reported by TMatch-All. By an easy induction it can be shown that for every data node d0 in D there is a call TMatch-All for d0 ’s subtree and Q. In particular, there was a call TMatch-All(u, qfrom , qroot ). Since 30 M. G¨ otz, C. Koch, and W. lastChild, qfrom , qroot ) < qroot − 1, (because otherwise qroot and u would have been compared and u would have been written to the output). In general, we have that HMatch-All(d, q1 , q2 )=min (HMatch(d, q1 , q2 ), qroot −1).

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