1. Guest editorial

   • Paolo Atzeni
   • Alberto O. Mendelzon

   Editorial Pages: 1 - 1

2. Semantic caching of Web queries

   • Boris Chidlovskii
   • Uwe M. Borghoff

   Special section Pages: 2 - 17

3. Learning response time for WebSources using query feedback and application in query optimization

   • Jean-Robert Gruser
   • Louiqa Raschid
   • Tao Zhan

   Special section Pages: 18 - 37

4. Declarative specification of Web sites with Strudel

   • Mary Fernández
   • Daniela Florescu
   • Dan Suciu

   Special section Pages: 38 - 55

5. Analysis of navigation behaviour in web sites integrating multiple information systems

   • Bettina Berendt
   • Myra Spiliopoulou

   Special section Pages: 56 - 75

6. UnQL: a query language and algebra for semistructured data based on structural recursion

   • Peter Buneman
   • Mary Fernandez
   • Dan Suciu

   Special section Pages: 76 - 110