It appears that IncludeTransformer might work if I 
pass the parameters in the url, which would make an 
ugly mess out of my code.

IncludeTransformer is pretty simple. Would it be 
appropriate to add optional protocol for controlling 
the request (GET, POST) and passing parameters in an 
element? Or would it be better to add some new thing 
like a rewrite of the old CIncludeTransform?
It seems excessive to have Include, XInclude, and 
CInclude...

This is what I'm doing now with C2:

<ci:includexml>
    <ci:configuration>
        <ci:src>http://myserver/cgi-bin/someScript.sh</ci:src>
        <ci:parameter>
            <ci:name>method</ci:name>
            <ci:value>POST</ci:value>
        </ci:parameter>
    </ci:configuration>
    <ci:parameters>
        <ci:parameter>
            <ci:name>param1</ci:name>
            <ci:value>value1</ci:value>
        </ci:parameter>
         ...
    </ci:parameters>
</ci:include>

I think it would be good for C3 to have some kind of "door" to
invoke scripts on the server. And cramming things onto the URL
and using GET isn't very attractive.

Thanks!

-Hugh