water_solubility 0.00169 mg/mL at 25 C formal_charge -1 ChemAxon ##

##

use XML::Twig::XPath;

my $twig= XML::Twig::XPath->new();
$twig->parsefile('myfile.xml');

print $twig->findvalue
('/root/predicted_properties/property/kind[text()="formal_charge"]/
following-sibling::value');

##

##

-1