The App 

• http://www.gamma.net.nz/eb/

• Postgres, mason, apache2

• Pretty simple

• Uses LibXML to output xml

• Create the document

my $dom = XML::LibXML::Document->new('1.0', 'UTF-8');
my $kml = $dom->createElement('kml');
$kml->setAttribute('xmlns', 'http://earth.google.com/kml/2.1');
$dom->setDocumentElement($kml);
my $document = $dom->createElement('Document');
$kml->appendChild($document);