The Simple Object Access Protocol (SOAP) uses XML to define
a protocol for the exchange of information in distributed
computing environments. SOAP consists of three components:
an envelope, a set of encoding rules, and a convention for
representing remote procedure calls. Unless experience with
SOAP is a direct requirement for the open position, knowing
the specifics of the protocol, or how it can be used in
conjunction with HTTP, is not as important as identifying it
as a natural application of XML.