Service Component Architecture (SCA) provides a programming model for building applications
and solutions based on a Service Oriented Architecture. It is based on the idea that business
function is provided as a series of services, which are assembled together to create solutions that
serve a particular business need. These composite applications can contain both new services
created specifically for the application and also business function from existing systems and
applications, reused as part of the composition. SCA provides a model both for the composition
of services and for the creation of service components, including the reuse of existing application
function within SCA composites.
