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Most REST service providers publish documentation, either with an XSD Schema set (just like you use in a SOAP call) or more free-format documentation. They usually include one or more example request and response messages, from which you can (should be able to) derive a Domain schema. In your REST service, you can choose between an XSD Schema set or a Domain schema. The first option with an XSD is for services that accept and send XML messages, and that is similar to calling a SOAP service. If a different format such as JSON is required (like in this visual), you should use a Domain schema.
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