It's in Randy Kobes' repository of Perl modules.

http://theoryx5.uwinnipeg.ca/ppmpackages/

"The first rule of Perl club is you do not talk about Perl club."
-- Chip Salzenberg

XML-LibXML.ppd
XML-LibXML-Common.ppd
XML-LibXML-Iterator.ppd
XML-LibXSLT.ppd
XML-XPath.ppd
XML-SAX.ppd
[download]

E:\xml2xml\xslt>perl libxslt.pl
Can't load 'C:/Perl/site/lib/auto/XML/LibXML/Common/Common.dll' for mo
+dule XML::
LibXML::Common: load_file:One of the library files needed to run this 
+applicatio
n cannot be found at C:/Perl/lib/DynaLoader.pm line 229.
 at C:/Perl/site/lib/XML/LibXML.pm line 11
Compilation failed in require at C:/Perl/site/lib/XML/LibXML.pm line 1
+1.
BEGIN failed--compilation aborted at C:/Perl/site/lib/XML/LibXML.pm li
+ne 11.
Compilation failed in require at C:/Perl/site/lib/XML/LibXSLT.pm line 
+8.
BEGIN failed--compilation aborted at C:/Perl/site/lib/XML/LibXSLT.pm l
+ine 8.
Compilation failed in require at libxslt.pl line 1.
BEGIN failed--compilation aborted at libxslt.pl line 1.
[download]