A significant QoS assurance challenge for DRE systems stems from the need to
configure and fine tune the middleware platforms that host these systems.
Middleware configuration is a hard problem due to the large configuration space


Model to model transformations are an integral part of many software development
processes, such as OMG's Model Driven Architecture.  When a single source model
must be transformed to a class of target models that have substantial
commonalities, existing techniques tend to reinvent most of the model
transformation logic resulting in the tr