/usr/share/doc/libgraphviz-perl/examples/xref.pl is in libgraphviz-perl 2.04-1.
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 | #!/usr/bin/perl -w
#
# This script illustrates how cross-referencing using the
# B::Xref module can work
use strict;
qx(perl -MO=Xref,-r ../lib/GraphViz.pm > GraphViz.xref; ./xref_aux.pl GraphViz.xref > GraphViz.png);
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