|InfoPath Developer Reference|
Version Added: InfoPath 2003
expression An expression that returns a WebServiceAdapter object.
The input element of the .xsf file contains information about the parts of the input Simple Object Access Protocol (SOAP) message that are used to communicate with the Web service. Specific parts in the SOAP message are replaced by Microsoft Office InfoPath 2007 with data from within the form. It is used when a secondary data source is populated with data from a Web service, and InfoPath needs to pass arguments to the Web service to retrieve the data that it provides.
Security Level 2: Can be accessed only by forms running in the same domain as the currently open form, or by forms that have been granted cross-domain permissions.
In the following example, the Input property of the WebServiceAdapter object is used to display the input string of the Web service data adapter in a message box: