1. Guest Editors' Introduction

   • Elisa Bertino
   • Tok Wang Ling
   • Umesh Dayal

   Editorial Introduction Pages: 5 - 6

2. PTC: Proxies that Transcode and Cache in Heterogeneous Web Client Environments

   • Aameek Singh
   • Abhishek Trivedi
   • Prashant Shenoy

   OriginalPaper Pages: 7 - 28

3. A Transaction Model for XML Databases

   • Stijn Dekeyser
   • Jan Hidders
   • Jan Paredaens

   OriginalPaper Pages: 29 - 57

4. Web Communities: Models and Algorithms

   • Gianluigi Greco
   • Sergio Greco
   • Ester Zumpano

   OriginalPaper Pages: 59 - 82

5. RAL: An Algebra for Querying RDF

   • Flavius Frasincar
   • Geert-Jan Houben
   • Peter Barna

   OriginalPaper Pages: 83 - 109

6. Authorization Translation for XML Document Transformation

   • Somchai Chatvichienchai
   • Mizuho Iwaihara
   • Yahiko Kambayashi

   OriginalPaper Pages: 111 - 138