Official definition:
A web service is a software system designed to support interoperable machine-to-machine interaction over a network
It has an interface described in a machine-processable format (specifically WSDL)
Other systems interact with the service in a manner prescribed by its description using SOAP messages
These are conveyed using HTTP with XML serialization in conjunction with other Web-related standards
W3C. (2004). Web Services Architecture. http://www.w3.org/TR/2004/NOTE-ws-arch-20040211/
II. What are web services?
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