Saxon XSLT and XQuery Processor

Saxon 6.5.1 and 7.0 were tested with JDOM beta 7, and
they do not work with JDOM beta 8, which has made
incompatible changes to the way text nodes are
represented.

Source code fixed in both branches (tested in the 7.0
branch only). The new code works with both JDOM beta 7
and JDOM beta 8.

At line 56 of jdom.NodeWrapper, change
if (node instanceof String)
to
if (node instanceof String || node instanceof Text)

The change to JDOM means that the wrapper need no
longer maintain a pointer to the wrapper for the
parent node; however, I have left it in for the time
being.