gistfile1.js

var fs = require('fs'), libxml = require('./libxmljs');

var parser = new libxml.SaxPushParser(function(cb) {
  var stack = [];
  cb.onStartDocument(function() {
    console.log('Starting to parse ...');
  });
  cb.onStartElementNS(function(elem, attrs, prefix, uri, namespaces) {
    var obj = {};
    obj['@'] = {};
    obj['#'] = "";
    for (var i=0,len=attrs.length; i<len; i++)
      obj['@'][attrs[i][0]] = attrs[i][3];
    stack.push(obj);
  });
  cb.onEndElementNS(function(elem, prefix, uri) {
    var obj = stack.pop();
    if (stack.length > 0) {
      if (typeof stack[stack.length-1][elem] === 'undefined')
        stack[stack.length-1][elem] = obj;
      else if (Array.isArray(stack[stack.length-1][elem]))
        stack[stack.length-1][elem].push(obj);
      else {
        var old = stack[stack.length-1][elem];
        stack[stack.length-1][elem] = [];
        stack[stack.length-1][elem].push(old);
      }
    } else {
      console.log('Finished parsing. Result:');
      console.dir(obj);
    }
  });
  cb.onCharacters(function(chars) {
    chars = chars.trim();
    if (chars.length)
      stack[stack.length-1]['#'] += chars;
  });
});

var fstream = fs.createReadStream('foo.xml', { encoding: 'utf8' });
fstream.on('data', function(chunk) {
  parser.push(chunk);
});

Just wanted a permanent copy for myself.