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  1. or download this
    my $xpc = XML::LibXML::XPathContext->new( $doc );
$xpc->registerNs( ota => 'http://www.opentravel.org/OTA/2003/05' );
my @options = $xpc->findnodes('//ota:OriginDestinationOption');
  2. or download this
    # Doesn't work because OriginDestinationOption belong to
# the http://www.opentravel.org/OTA/2003/05 NS, not the
...

my $root = $doc->documentElement();
my @opts = $root->findnodes("//OriginDestinationOption");
  3. or download this
    # Doesn't work because OriginDestinationOption element
# appears as <OriginDestinationOption>, rather than
...

my $root = $doc->documentElement();
my @opts = $root->findnodes("//ota:OriginDestinationOption");
  4. or download this
    my $root = $doc->documentElement();
my @opts = $root->findnodes("//*[name()="OriginDestinationOption"]');