include "libxml.sol"
xml exo
customer name = "A"
"2356"
/customer
customer name = "B"
"-25"
/customer
/xml
print "Adding content of elements..."
dom x = dom()
x.build()
int sum
x.customer.at() ` points out first customer
while x.found()
sum + x.getData().toInt() ` reads content, converts and add it
let x.next() ` next customer
print "sum of elements=", sum