Facet-oriented Modelling

Models are the central assets in model-driven engineering (MDE), as they actively used all phases of software development. built using metamodel-based languages, and so objects models typed by a metamodel class. This typing is static, established at creation time, cannot be changed later. Therefore, MDE closed fixed with respect to class conform to, fields have, well-formedness constraints must comply with. hampers many activities, like reuse model-related artefacts such transformations, opportunistic or dynamic combination metamodels, reconfiguration models. To alleviate this rigidity, we propose making model open that can acquire drop so-called facets . These contribute type, holding them. Facets defined regular hence being lightweight extension standard metamodelling. Facet metamodels may declare usage interfaces , well laws govern assignment (or classes). article describes our proposal, reporting on theory, analysis techniques, an implementation. The benefits approach validated basis five case studies dealing annotation models, transformation reuse, multi-view modelling, multi-level language product lines.