 These diagrams define the specification of the application or service layers, and give the user a navigation path (drill-down) from the high-level applications into the inner implementation details.The factory models (using DSL’s) the internal implementation of the applications and services based upon a logical, technology-independent architecture and SOA patterns.This architecture is composed of several layers which are then extended and implemented by pluggable ‘Artefact Generators’ (or ‘technology providers’).