1. A method for extracting a platform independent model (PIM) from a composite application, the method comprising: identifying existing implementation artifacts of the composite application; transforming the identified implementation artifacts for generating a platform specific model (PSM), wherein generating a PSM includes one or more transformations between the implementation artifacts and one or more meta-models of the PSM; and transforming the PSM for generating a PIM, wherein generating a PIM includes one or more transformations between the one or more meta-models of the PSM and one or more meta-models of the PIM.