Software language engineering: preface

We are pleased to present the proceedings of the Second International Conferenceon Software Language Engineering (SLE 2009). The conference was held in Denver, Colorado (USA) during October 5–6, 2009 and was co-located with the 12th IEEE/ACM International Conference on Model-Driven Engineering Languages and Systems (MODELS 2009) and the 8th ACM International Conference on Generative Programming and Component Engineering (GPCE 2009).The SLE conference series is devoted to a wide range of topics related to artificiallanguages in software engineering. SLE is an international research forum that brings together researchers and practitioners from both industry and academia to expand the frontiers of software language engineering