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tokens: We would like to thank the anonymous referee for the useful comments and suggestions. XXL is an international project based around an XMM Very Large Programme surveying two 25 deg extragalactic fields at a depth of erg s cm in [0.5−2] keV at the 90% completeness level (see Paper I). The XXL website is http://irfu.cea.fr/xxl . Multiband information and spectroscopic follow-up of the X-ray sources are obtained through a number of survey programmes, summarised at http://xxlmultiwave.pbworks.com/ . The authors acknowledge L. Chiappetti for producing a format and catalog compliance report. EK acknowledges fellowship funding provided by the Greek General Secretariat of Research and Technology in the framework of the programme Support of Postdoctoral Researchers, PE-1145. E.K. acknowledges the Centre National d’Études Spatiales (CNES) and CNRS for support of post-doctoral research. Y.J. and the Marie Curie Actions of the European Commission (FP7-COFUND) acknowledges support by FONDECYT grant N. 3130476. O.M. is grateful for the financial support provided by the NEWFELPRO fellowship project in Croatia. F.P. acknowledges support from the BMBF/DLR grant 50 OR 1117, the DFG grant RE 1462-6 and the DFG Transregio Programme TR33. This work is based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/IRFU, at the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada, the Institut National des Sciences de l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at Terapix available at the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS.