Keynotes -- Eating Our Own Dog Food: DSLs for Generative and Transformational Engineering -- If MDE Is the Solution, Then What Is the Problem? -- Regular Papers -- Language Evolution in Practice: The History of GMF -- A Novel Approach to Semi-automated Evolution of DSML Model Transformation -- Study of an API Migration for Two XML APIs -- Composing Feature Models -- VML* – A Family of Languages for Variability Management in Software Product Lines -- Multi-view Composition Language for Software Product Line Requirements -- Yet Another Language Extension Scheme -- Model Transformation Languages Relying on Models as ADTs -- Towards Dynamic Evolution of Domain Specific Languages -- ScalaQL: Language-Integrated Database Queries for Scala -- Integration of Data Validation and User Interface Concerns in a DSL for Web Applications -- Ontological Metamodeling with Explicit Instantiation -- Verifiable Parse Table Composition for Deterministic Parsing -- Natural and Flexible Error Recovery for Generated Parsers -- PIL: A Platform Independent Language for Retargetable DSLs -- Graphical Template Language for Transformation Synthesis -- A Role-Based Approach towards Modular Language Engineering -- Language Boxes -- Declarative Scripting in Haskell -- An Automated Process for Implementing Multilevel Domain Models -- Domain-Specific Metamodelling Languages for Software Language Engineering -- Generating Smart Wrapper Libraries for Arbitrary APIs -- Closing the Gap between Modelling and Java.

This book constitutes the thoroughly refereed post-conference proceedings of the Second International Conference on Software Language Engineering, SLE 2009, held in Denver, CO, USA, in October 2009. The 15 revised full papers and 6 revised short paper presented together with 2 tool demonstration papers were carefully reviewed and selected from 75 initial submissions. The papers are organized in topical sections on language and model evolution, variability and product lines, parsing, compilation, and demo, modularity in languages, and metamodeling and demo.