Lecture Notes in Computer Science 5404 CommencedPublicationin1973 FoundingandFormerSeriesEditors: GerhardGoos,JurisHartmanis,andJanvanLeeuwen EditorialBoard DavidHutchison LancasterUniversity,UK TakeoKanade CarnegieMellonUniversity,Pittsburgh,PA,USA JosefKittler UniversityofSurrey,Guildford,UK JonM.Kleinberg CornellUniversity,Ithaca,NY,USA AlfredKobsa UniversityofCalifornia,Irvine,CA,USA FriedemannMattern ETHZurich,Switzerland JohnC.Mitchell StanfordUniversity,CA,USA MoniNaor WeizmannInstituteofScience,Rehovot,Israel OscarNierstrasz UniversityofBern,Switzerland C.PanduRangan IndianInstituteofTechnology,Madras,India BernhardSteffen UniversityofDortmund,Germany MadhuSudan MassachusettsInstituteofTechnology,MA,USA DemetriTerzopoulos UniversityofCalifornia,LosAngeles,CA,USA DougTygar UniversityofCalifornia,Berkeley,CA,USA GerhardWeikum Max-PlanckInstituteofComputerScience,Saarbruecken,Germany Mogens Nielsen Antonín Kucˇera Peter Bro Miltersen Catuscia Palamidessi Petr Tu˚ma Frank Valencia (Eds.) SOFSEM 2009: Theory and Practice of Computer Science 35th Conference on Current Trends in Theory and Practice of Computer Science Špindleru˚v Mlýn, Czech Republic, January 24-30, 2009 Proceedings 1 3 VolumeEditors MogensNielsen UniversityofAarhus,AarhusGraduateSchoolofScience NyMunkegadeBldg1521-110,DK-8000AarhusC,Denmark E-mail:[email protected] AntonínKucˇera MasarykUniversity,FacultyofInformatics Botanická68a,60200Brno,CzechRepublic E-mail:tony@fi.muni.cz PeterBroMiltersen UniversityofAarhus,DepartmentofComputerScience IT-parken,Aabogade34,DK-8200AarhusN,Denmark E-mail:[email protected] CatusciaPalamidessi FrankValencia EcolePolytechnique RuedeSaclay,91128PalaiseauCedex,France E-mail:{catuscia,frank.valencia}@lix.polytechnique.fr PetrTu˚ma CharlesUniversity,FacultyofMathematicsandPhysics Malostranskénámeˇstí25,11800Prague1MaláStrana,CzechRepublic E-mail:[email protected] LibraryofCongressControlNumber:Appliedfor CRSubjectClassification(1998):F.2,F.1,D.2,H.3,H.2.8,H.4,F.3-4 LNCSSublibrary:SL1–TheoreticalComputerScienceandGeneralIssues ISSN 0302-9743 ISBN-10 3-540-95890-8SpringerBerlinHeidelbergNewYork ISBN-13 978-3-540-95890-1SpringerBerlinHeidelbergNewYork Thisworkissubjecttocopyright.Allrightsarereserved,whetherthewholeorpartofthematerialis concerned,specificallytherightsoftranslation,reprinting,re-useofillustrations,recitation,broadcasting, reproductiononmicrofilmsorinanyotherway,andstorageindatabanks.Duplicationofthispublication orpartsthereofispermittedonlyundertheprovisionsoftheGermanCopyrightLawofSeptember9,1965, initscurrentversion,andpermissionforusemustalwaysbeobtainedfromSpringer.Violationsareliable toprosecutionundertheGermanCopyrightLaw. springer.com ©Springer-VerlagBerlinHeidelberg2009 PrintedinGermany Typesetting:Camera-readybyauthor,dataconversionbyScientificPublishingServices,Chennai,India Printedonacid-freepaper SPIN:12601028 06/3180 543210
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