Greetings,

Is there general agreement on what a "Service" is and what an
"Application" is in the context of a SOA?

Some of the definitions I've come across for a Service are:

"A service is a location on the network that has a machine-readable
description of the messages it receives and optionally returns" -- SOA
with Web Services by Eric Newcomer & Greg Lomow

"A discrete unit of logic that exist autonomously that conform to a set
of principles that allow them to evolve independently, while still
maintaining a sufficient amount of commonality and standardization" --
SOA by Thomas Erl

Others include - "A service is defined as a computer program that
provides a self-contained, stateless function, which accepts one or more
requests and returns one or more responses through a well-defined
interface."

Definition of Application range from "An application is a computer
program with a user interface" to others much more esoteric.

While I don't exactly expect everyone to agree, is there at least a
description of what a Service is and an Application is in a SOA that
folks can actually live with?

Regards,

- Anil





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