Web Services - WSDL: Messages

PHP Web Services Using WSDL Step By Step Tutorial - Part 4: a message is an abstract definition of the data being transmitted. Message define input and output parameters. Input which you send parameter to server. Output which you get result from server. Look our code:

  <message name="doHello">
    <part name="yourName" type="tns:getName" />
  </message>
  
  <message name="doHelloResponse">
    <part name="return" type="tns:HelloResponse" />
  </message>

Relationship message and types can you read below: