PCO 2.1 and SAP MII 12.1 - Custom Agent Development

Good Day ,

We need to develop a custom PCO agent that will connect to a
driver that we wrote and query the driver for information. The driver is a
webserviced enabled driver thus it publishes a wsdl etc.

Now it is easy accessing this from the c# environment and extracting
the information.

However the comms from SAP MII is what I have the question
about. When setting up the PCO agent one can select Tag Queries and Custom
Queries.

Now how would I go about using the custom query to then invoke
the required web service call in the driver that we developed ?

In the Past writing a UDC connector you could expose functions
which would be available a mode by querying
the mode list, and then pass the required parameters through.

But how would this work with PCO 2.1 and MII 12.1 ?

All samples that I have seen up to now only shows tag based
queries, which in this case would not work for us.

Regards