An XML viewer/editor that provides XPath for nodes
oXygen offers you the possibility to copy the XPath location of an element and then you can use that in your XSLT. However, that is not the way you should work...
oXygen provides XPath content completion when you edit the XSLT document. It offers you the element and attribute name tests looking into the XML associated with the XSLT in the transformation scenario. You can find more details and a link to a video demo here http://www.oxygenxml.com/xslt_editor.html#xpathAwareCC
Hope that helps, George
if its only for xpath .. one can use notepad ++ software with its plug-ins relevant to xml,
I have been using this from many days :) it works just fine :))
XML Spy http://www.altova.com/xmlspy.html