RSS XSL file creation problem

[GCFI]

I have a lsoft listserv feed that I am trying to incorporate into our site using a xsl file. This is the address of the xml file: http://listserv.gcfi.org/scripts/wa-GCFI.exe?RSS&L=STROMBUS-L&v=2.0

The method works fine with xml files with the .xml extension but not this feed. I have tried changing the XMLPrefixesForDfaultNS.xml file by adding the following line after the <namespace prefix="rss2" uri=" http://backend.userland.com/rss2"/> line:
<namespace prefix="rss2" uri=" http://listserv.gcfi.org/scripts/wa-GCFI.exe?RSS&L=STROMBUS-L&v=2.0"/> (I have also changed the namespace prefix to a custom name but it still does not work.)

The schema for the feed also indicates that there is 'expected whitespace' and does not show the structure of the xml feed.

The error message I get on rendering the page is this: SAXParseException: Unterminated entity reference, 'z' (wa-GCFI.exe?RSS&L=STROMBUS-L&v=2.0,line 370, column 52)

I am running php 5.x on an apache server. As I mentioned, this works fine with .xml files.

Any help is greatly appreciated!!!


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[GCFI · Accepted solution]

OK - I found out the answer - the listserv list was set to 'private' and it needed to be set to 'public'. It now reads the file as xml.