collection issue, update/rename file

input a directory full of .xml files

running a transform to modify one element, identity
transform for the rest.

(Yes, I have created a backup)

I want to
process A.xml, write out A.xml ... somehow
(no I'm not on Linux to make it easy)

I'm using
  <xsl:for-each select="collection('file:///Long-path?select=*.xml')">
  <xsl:result-document
	href="???"
	method="xml"
	encoding="utf-8"
       indent="yes">

	<xsl:apply-templates/>


base-uri(.) returns the full pathname of the source document?
Do I have to work with that to obtain A.xml?
 (text processing....)
Is there some way I can obtain the filename.extn?

TIA Dave