/usr/share/doc/libxml-writer-perl/examples/double-escaping-example.pl is in libxml-writer-perl 0.612-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | #!/usr/bin/perl -w
# Demonstrate that ampersands are double-escaped
# Even if your text looks like already-escaped XML, it will be escaped
# again to make sure that the same text arrives at the other end.
use strict;
use XML::Writer;
my $w = new XML::Writer();
$w->startTag('doc');
$w->characters('In HTML and XML, an ampersand must be escaped as &');
$w->endTag('doc');
$w->end();
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