XML Representation of Constraint Networks: Format XCSP 2.1

We propose a new extended format to represent constraint networks using XML. This format allows us to represent constraints defined either in extension or in intension. It also allows us to reference global constraints. Any instance of the problems CSP (Constraint Satisfaction Problem), QCSP (Quantified CSP) and WCSP (Weighted CSP) can be represented using this format. A subset of this format will be used for the third international competition of CSP solvers which will be held during summer 2008 (deadline: May 10, 2008). The release of this document is January 15, 2008. 1 ar X iv :0 90 2. 23 62 v1 [ cs .A I] 1 3 Fe b 20 09