var libxmljs = require('libxmljs2');
var xml =
  '<?xml version="1.0" encoding="UTF-8"?>' +
  '<root>' +
  '<child foo="bar">' +
  '<grandchild baz="fizbuzz">grandchild content</grandchild>' +
  '</child>' +
  '<sibling>with content!</sibling>' +
  '</root>';

var xmlDoc = libxmljs.parseXml(xml);

// xpath queries
var gchild = xmlDoc.get('//grandchild');

console.log(gchild.text()); // prints "grandchild content"

var children = xmlDoc.root().childNodes();
var child = children[0];

console.log(child.attr('foo').value()); // prints "bar"