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if ( $xc->findnodes( 'advisories/cve', $vuln )) {        
    for ( $xc->findvalue( 'advisories/cve', $vuln )) {
        push ( @cve_records, $_ );
    }
}

for my $cve_node ($xc->findnodes('advisories/cve', $vuln)) {
    push @cve_records, $cve_node->textContent();
}

$fnd_vuln_id = $_->findvalue('./@id');

my $fnd_vuln_id = $_->findvalue('./@id');

my $fnd_vuln_id = $_->findvalue('@id');

my $fnd_vuln_id = $_->getAttribute('id');