[jdom-interest] Transforming multiple sources into out result

[Brian Sayatovic/AMIG]

I'm using JDOM b9 and Xalan to do some pretty convoluted trasforms.  At one
point, I need to transform two Documents into one.

My previous solution, which was kind of ugly, was to clone the root element
of each document and add it to a new, combined Document, then apply the
transform to that document.

However, when I switched to b9, I thought I found a better solution (which
I ca't get to work).  What I'd like to do is transform using the
JDOMSource(List) form of the source constructor.  As I read it, it should
for any list of JDOM nodes (which I think includes, Document, Element,
Comment, etc.).  However, after I transform, the resulting Document errors
because "Root element not set".

I've seen some solutions that use the "document()" xsl function, but I
don't want to use that because my documents don't exist on disk -- they
exist transiently in memory (the documentation days that the "document()"
function requires URIs to the XML documents which implies physical
locations).

Any ideas?

Regards,
Brian.