1. Editorial

   • Natasha Alechina

   EditorialNotes Pages: 261 - 262

2. Guards, Bounds, and Generalized Semantics

   • Johan van Benthem

   OriginalPaper Pages: 263 - 279

3. Guarded Fragments with Constants

   • Balder ten Cate
   • Massimo Franceschet

   OriginalPaper Pages: 281 - 288

4. Deciding Regular Grammar Logics with Converse Through First-Order Logic

   • Stéphane Demri
   • Hans De Nivelle

   OriginalPaper Pages: 289 - 329

5. The Semijoin Algebra and the Guarded Fragment

   • Dirk Leinders
   • Maarten Marx
   • Jan Van den Bussche

   OriginalPaper Pages: 331 - 343

6. A Guarded Fragment for Abstract State Machines

   • Antje Nowack

   OriginalPaper Pages: 345 - 368

7. Complexity of the Two-Variable Fragment with Counting Quantifiers

   • Ian Pratt-Hartmann

   OriginalPaper Pages: 369 - 395