Theory and practice of model transformations : 7th international conference, ICMT 2014 : held as part of STAF 2014 : York, UK, July 21-22, 2014 : proceedings : STAF federated event : ICMT2014 : 7th international conference on model transformation : STAF 2014 (software technology: applications and foundations) conference : Jul 2014, York, UK.