I'm trying to compare two nodes using 'isSameNode'. However, one of the nodes is created via 'parse_balanced_chunk'. From the http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node3-isSameNode document, is says "This method provides a way to determine whether two Node references returned by the implementation reference the same object."
So I'm wonder is it not working as I would expect because they are indeed coming from two different sources (one from the parsed txt file, the other from parse_balance_chunk)?
Here is the 'test_in.xml' & code:
<?xml version="1.0"?>
<TT>
<A>ZAB</A>
<B>ZBW</B>
<C>
<D>
<E>ZSE</E>
<F>ZLC</F>
</D>
</C>
<C>
<K>
<H>dog</H>
<E>one123</E>
<M>bird</M>
</K>
</C>
</TT>
use warnings;
use strict;
use XML::LibXML;
my $parser = XML::LibXML->new({keep_blanks=>(0)});
my $dom = $parser->load_xml(location => 'test_in.xml') or die;
#called in scalar context ($na1)
my ($na1) = $dom->findnodes('//D');
my ($na2) = $dom->findnodes('//D');
my $X1 = $na1->isSameNode($na2); ##MATCHES
my ($frg) = $parser->parse_balanced_chunk ("<D><E>ZSE</E><F>ZLC</F></D>");
my $X2 = $na1->isSameNode($frg); ##WHY NO MATCH?
my ($na3) = $frg->findnodes('//D');
my $X3 = $na1->isSameNode($na3); ##WHY NO MATCH?
print "SAME?: $X1\n";
print "SAME?: $X2\n";
print "SAME?: $X3\n";
And the output:
SAME?: 1
SAME?: 0
SAME?: 0
So the first 'isSameNode' test obviously MATCHES (same exact findnodes & xpath expression). But neither of the 2nd or 3rd 'isSameNode' tests work using the node from the 'parsed_balance_chunk'. Is it something simple I'm overlooking with the syntax or is it just that I can't compare two nodes this way? If not, what is the method for comparing two nodes? Waht I'm ultimately trying to determine if a block of xml code (i.e. from a previous parsed_balance_chuck) already exist in the xml file.
