the answer may be here http://www.perlmonks.org/?node_id=830411 courtesy of ikegami 

 
my $parser = XML::LibXML->new();
$parser->keep_blanks(0);
...
my $changed = $dom->toString(1);

[download]

I take no credit for this answer other than having been looking for the same answer for a couple of days before finding it.

In reply to Re: XML::LibXML unbindNode leaves blank lines in the xml file by Anonymous Monk
in thread XML::LibXML unbindNode leaves blank lines in the xml file by anadem

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