A service-oriented description of a collection of processes and workflows supporting at least one application, domain or business process.

An application or service implementation (or its service instances) that interacts with other (provider) service implementations (or their service instances) requesting that the providers perform some function for the requestor.

[Note - as of April 2007, this term is no longer a core term. It has been replaced by "data sources"].

A resource is a term that can have many meanings depending upon context. Often, but not always, it can be a synonym for "data sources". More generally, it can refer to anything that can be uniquely identified.