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What is a SOAP envelope element?

SOAP envelope element is the root element of a SOAP message which defines the XML document as a SOAP message. 

<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">
  ...
  Message information
  ...
</soap:Envelope>

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