app.js

//package.json: {"dependencies": {"xml2js": "~0.4.13","underscore": "~1.8.3"}}
var xml2js = require('xml2js');
var fs = require('fs');
var _ = require('underscore');
_.isScalar = function(o) { return o===null || (typeof o !== "object"); };

function summarizeXMLObject(obj, context) {
  //Assume that array elements all have the same internals
  if (_.isArray(obj)) {
      //console.log(context);
      summarizeXMLObject(obj[0], context+"[]");
  }
  //Enumerate and recurse into most objects
  else if (_.isObject(obj)) {
     _.each(obj, function(v,k) {
        //Is this a '$' node? It's an attribute holder - subattrs are all leaves
        if (k==='$') {
            _.each(v, function(v,k) { console.log(context+"("+k+")\t", v ); });
        //Is this a leaf node? Show the value.
        } else if (_.isScalar(v)) {
            console.log(context+"/"+k+"\t", v);
        //Otherwise it has descendents, show them
        } else {
            context = context ? context+"/"+k : k;
            console.log(context);
            summarizeXMLObject(v, context);
        }
     });
  }
}


var filename = process.argv[2];
if (typeof filename === "undefined") throw "Pass input filename as first arg";
if (!fs.existsSync(filename)) throw "Input filename does not exist";

var parser = new xml2js.Parser({explicitArray : false});
fs.readFile(filename, function(err, data) {
    parser.parseString(data, function (err, result) {
        console.log("NODE", "EXAMPLE CONTENT");
        summarizeXMLObject(result, "");
    });
});