Use the REST API request body to send data in the request. A request body is used with a method that can have a body attached to it, such as the POST and the PUT methods. The body of data is written after the header lines. If the request message has a body, use the Content-Type header field to specify the format of the body in the request header.
The XML Schema Definition (XSD) files describe what elements and attributes you can use. The content of the request body depends on the element types that you define in the XSD files.