1. A method implemented by a computer system, the method comprising: receiving arguments associated with a business service call, wherein the arguments comprise an identification of the business service, a method of the business service to be invoked, and one or more arguments of the method; accessing metadata that describes how to convert the business service call to a web service call; generating an invocation request for the web service using the metadata and the arguments; and invoking the web service call by transmitting the generated request to the web service, wherein said transmitting is performed in accordance with the provided metadata.