@article{xmlrepresentationofconstraintnetworks,
  title = {XML Representation of Constraint Networks: Format XCSP 2.1},
  author = {Olivier Roussel and Christophe Lecoutre},
  year = {2009},
  eprint = {0902.2362},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/0902.2362v1},
}