[Greasemonkey] evaluate and XPCNativeWrapper in 0.6.4

[Bruce Perry]

I've bought "Greasemonkey Hacks" and I'm trying to get started with 
GreaseMonkey.  I've installed GreaseMonkey 0.6.4 on Firefox 1.5.  I'm 
trying to use XPath to get a collection of elements so that I can pull info 
from the elements.

Here's the code:

//get the page's h2 elements
var snap = document.evaluate("//h2", document, null, 
XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);

for (var i = snap.snapshotLength - 1; i>=0; i--){

var elm = snap.snapshotItem(i);

alert('IT '+ elm +" " + elm.getAttribute('outerHTML'));
}

This code gets the right number of elements and iterates through them.  The 
variable 'elm' shows up in the alert box as '[object XPCNativeWrapper 
[object HTMLHeadingElement]].  If I try something like elm.outerHTML, the 
result is 'undefined'.

I surmise that the 0.6.4 update has probably changed something.  I read 
somewhere that in 0.6.4 that almost everything is returned in an 
XPCNativeWrapper now.

Similar code in the "Zap Ugly XML Buttons" script works fine, but isn't 
trying to get anything out of the items that it's looping on.  Can someone 
point me at an example of how to get data out of XPNativeWrapper items 
returned via XPath?

Thanks,

Bruce