POEM Potential slide-21

What's A Web Service?

| A service with a contract. Really a set of local "laws".

- a possibly remote procedure with an
- invocation that is described in a standard (preferably XML-based) machine readable syntax
- reachable via standard Internet protocols
- including at a minimum a description of the allowed input and output messages, as well as
- possible semantic annotation of the service function and data meaning.

http://drops.dagstuhl.de/opus/frontdoor.php?source_opus=526