##
#!/usr/bin/perl
use strict;
use warnings;
use XML::LibXSLT;
use XML::LibXML;
my $parser = XML::LibXML->new();
my $mathml = $parser->parse_string( do { local $/; <> } );
my $xform_src = $parser->parse_fh( \*DATA );
my $xform = XML::LibXSLT->new()->parse_stylesheet( $xform_src );
my $results = $xform->transform( $mathml );
print $xform->output_string( $results );
__END__
paste stylesheet here...