How to Determine a Web Message Part Type
You can determine if a Web message part type is a primitive .NET type or a schema type by using the Properties window for a given Web message type.
To determine a Web message part type
With an orchestration open, on the View menu, click Other Windows,and then click Orchestration View.
Expand the Multi-part Message Types node, and then expand a Web message type.
Select a message part.
A Web message part signature that begins as <project default namespace>.<Web reference name>.Reference.<schema root> is a schema type. The <schema root> part of the type is the root element of the Web reference schema that constructs the Web message part. Otherwise, the message part signature is a primitive .NET type such as System.String or System.Int32.