XCSP3 is a XML-based format designed to represent combinatorial constrained problems. It is compact, easy to read and to parse. Importantly, This new format (partly) captures the structure of the problem models, through the possibilities of declaring arrays of variables, and identifying syntactic and semantic groups of constraints.

XCSP3 introduces a limited set of basic constraint forms, and allows many variations of them through lifting, restriction, sliding, logical combination and relaxation mechanisms. As a result, XCSP3 encompasses practically all constraints that can be found in major constraint solvers.

The objective of XCSP3 is to ease the effort required to test and compare different algorithms by providing a common test-bed of combinatorial constrained instances.

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