Epsilon Wizard Language

EWL is a language tailored to interactive in-place model transformations on user-selected model elements (unlike ETL which operates in a batch mode). EWL is particularly useful for automating recurring model editing tasks (e.g. refactoring, applying patterns or constructing subtrees consisting of similar elements). EWL is integrated with EMF/GMF and as such, wizards can be executed from within EMF and GMF editors

• Execute wizards within EMF and GMF editors
• Define guards in wizards
• Undo/redo the effects of wizards on the model

• Support for simultaneously accessing/modifying many models of (potentially) different metamodels
• All the usual programming constructs (while and for loops, statement sequencing, variables etc.)
• Support for those convenient first-order logic OCL operations (select, reject, collect etc.)
• Ability to create and call methods of Java objects
• Support for dynamically attaching operations to existing meta-classes and types at runtime
• Support for cached operations
• Support for extended properties
• Support for user interaction
• Ability to create reusable libraries of operations and import them from different Epsilon (not only EOL) modules

• Screencast: Specifying and executing wizards in the UML2 class diagram editor
• Article: Bridging the Epsilon Wizard Language and the Eclipse Graphical Modeling Framework
• Article: Model Refactoring in GMF editors
• Article: Model Refactoring in EMF editors

Chapter 7 of the Epsilon book provides a complete reference of the syntax and semantics of EWL.