=head1 NAME
XML::GDOME::XPath::NSResolver - Interface XPathNSResolver implementation.
=head1 SYNOPSIS
$str = $xpnsresolv->lookupNamespaceURI($prefix);
=head1 METHODS
=over 4
=item $str = $xpnsresolv->lookupNamespaceURI($prefix);
Look up the namespace URI associated to the given namespace prefix. The XPath evaluator must never call this with a null or empty argument, because the result of doing this is undefined.
I<C<prefix>>: The prefix of the namespace to look for
I<Returns>: namespace URI
=back