4. The method of claim 1 , wherein the second client web service message contains a request that the server maintain a state of the execution of the XQuery expression, the method further comprising: in response to detecting the request that the server maintain the state of the execution of the XQuery expression, maintaining the state associated with the execution of the XQuery expression.
4. The method of claim 1 , wherein the second client web service message contains a request that the server maintain a state of the execution of the XQuery expression, the method further comprising: in response to detecting the request that the server maintain the state of the execution of the XQuery expression, maintaining the state associated with the execution of the XQuery expression. 9. The method of claim 4 , wherein the server web service message is a first server web service message that contains an identifier associated with the state of the execution of the XQuery expression, the method further comprising: receiving, at the server, a third client web service message that contains a request; wherein the request contains the identifier; and wherein a second server web service message that accounts for the state of execution of the XQuery expression is sent in response to the third client web service message that contains the request.