What is SOAP and how does it relate to XML?

What is SOAP and how does it relate to XML?
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OAP consists of three components: an envelope, a set of encoding rules, and a convention for representing remote procedure calls. The Simple Object Access Protocol (SOAP) uses XML to define a protocol for the exchange of information in distributed computing environments. 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.

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