2.2.6.1 SessionID Attribute
The SessionID is an attribute in the <Session> (section 2.2.3.2) and <EndSession> (section 2.2.3.3) elements, the value of which uniquely identifies an existing session. It is assigned by the server and returned in the response to a BeginSession (section 2.2.3.1) message.
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<xs:attribute name="SessionID" type="sessionId" use="required" />