1. A software development data processing system configured for melding mediation and adaptation modules of a service component architecture (SCA) system, the data processing system comprising: a host server with processor and memory configured for communicative coupling to a plurality of clients over a computer communications network; an operating system executing in the host server; an integrated development tool operating in the operating system; and, mediation module meld logic coupled to the integrated development tool, the mediation module meld logic comprising program code that when executed by the processor of the host server, loads respectively different descriptor files for each of a selected mediation module and a selected adaptation module, combines descriptors from the different descriptor files into a single descriptor file for a melded module, modifies names and wiring descriptors in the single descriptor file for the melded module to account for a combination of mediation flow components from each of the mediation module and the adaptation module in the melded module, loads the single descriptor file for the melded module, generate component artifacts for each descriptor in the single descriptor file, and deploy the component artifacts as the melded component in the SCA system defined by the integrated development tool.