Thank you, Maksim, it works :-)
I replaced the tanum in
$(ltap).children().map(function(i, tanum){
arr[tanum.localName] = ($(tanum).text());
});
with 'field':
$(ltap).children().map(function(i, field){
arr[field.localName] = ($(field).text());
});
because it works for all fields :-)