It appears that the "RPC" WSDL style is not presently supported by Visualforce.  Can someone please point me to the documentation on WSDL models supported by Visualforce.  More importantly what is the guidance for incorporating RPC-based WSDLs ?

We are presently getting the following error message.

Error: Failed to parse wsdl: Unsupported WSDL style 'rpc'.  Only supports Dcoument/litteral/wrapped services.

A WSDL document describes a Web service. A WSDL binding describes how the service is bound to a messaging protocol, particularly the SOAP messaging protocol. A WSDL SOAP binding can be either a Remote Procedure Call (RPC) style binding or a document style binding. A SOAP binding can also have an encoded use or a literal use. This gives you four style/use models.  Add to this collection a pattern which is commonly called the document/literal wrapped pattern and you have five binding styles to choose from when creating a WSDL file.
1.    RPC/encoded
2.    RPC/literal
3.    Document/encoded
4.    Document/literal
5.    Document/literal wrapped

* Reference: http://www.ibm.com/developerworks/webservices/library/ws-whichwsdl/