soapAction attribute in soap:Operation Element in WSDL



I was reading this wsdl file and i came across this binding element.



<binding name="FactorialServicePortBinding" type="tns:FactorialService"><soap:binding transport="http://ift.tt/LcBaVu" style="document"/><operation name="calculateFactorial"><soap:operation soapAction=""/><input><soap:body use="literal"/></input><output><soap:body use="literal"/></output></operation></binding>


And i am wondering what is this soapAction attribute in soap:operation element. Can anyone explain this attribute and it's usage ?? Thanks


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