FlexJS XML problem

[Harbs]

Given the following XML in Flash:
var xml:XML = <root/>;
xml.bar.foo.baz = "baz";

You get an XML structure like so:
<root>
  <bar>
    <foo>
      <baz>
        baz
      </baz>
    </foo>
  </bar>
</root>

In JS, this compiles to the following:

  var /** @type {XML} */ xml = new XML( '<root/>');
  xml.child('bar').child('foo').setChild('baz', "baz");

.child() returns an empty XMLList
.setChild() tries to add a child to that empty list and does not create the 
structure.

I’m not sure how to best solve this problem.

One idea would be to add a new function called getChild() which would return an 
existing element if it exists and create a new one if not. Then we could have 
the compiler rewrite the output to:

  xml.getChild('bar').getChild('foo').setChild('baz', "baz");

I’d prefer to try and figure out how to have setChild walk up the reference 
tree and create the correct elements automatically. I’m having trouble figuring 
out how to do that though.

Harbs