[jdom-interest] getDocument() patch

[Jason Hunter]

> An alternative solution would be to subclass Element. Name the 
> subclass RootElement
> ...
> The advantage of my suggested approach is mailly less memory 

I added a comment in Element.java pointing at this email in the archives
so if in the future we're ever needing to do memory cutting, we'll have
that idea on record.  Adding a subclass to save 4 bytes now would be a
definite premature optimization.

-jh-