I'd like to move some of my macros to scriptdef definitions, and I've
started to investigate how to do so. One aspect is escaping me. I
believe I understand how to pass an attribute, but I have a case where
I want to have my scriptdef pass an element on to the called macro.
From the API doc, it's not clear to me how I should do that. I've
googled for a tutorial or example, but I've been unable to find
anything (and I suspect my failed searches are due to me not knowing
the best search terms).

A trivialized example looks like so - how do I have wrapIt pass its
fileset element on to the call of doEcho?

 <macrodef name="doEcho">
   <attribute name="attr"/>
   <element name="fileset"/>
   <sequential>
     <echo message="doEcho: attr is... @{attr}"/>
   </sequential>
 </macrodef>

 <scriptdef name="wrapIt" language="groovy">
   <attribute name="attr"/>
   <element name="fileset" type="fileset"/>
   <![CDATA[
     attr = attributes.get("attr");
     fileset = elements.get("fileset");

     doEcho = project.createTask("doEcho");
     doEcho.setDynamicAttribute("attr", "Inner call!");
     if (null != fileset) {
       // What goes here?
     }
     doEcho.perform();
   ]]>
 </scriptdef>

In the API doc, I've looked at MacroInstance, and it's clear I
shouldn't be using createDynamicElement(). I suspect I need to be
working with a MacroDef, but I don't see how to piece everything
together to get what I'm after.

Apologies for the entry level question,
Ed

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