A little Node.js app that reads an OPML file into an outline structure, and displays the structure on the console.

readOpml.js

var request = require ("request");
var opmlParser = require ("opmlparser");
function stringMid (s, ix, len) { //8/12/14 by DW
	return (s.substr (ix-1, len));
	}
function filledString (ch, ct) { //6/4/14 by DW
	var s = "";
	for (var i = 0; i < ct; i++) {
		s += ch;
		}
	return (s);
	}
function outlineToText (theOutline, flIncludeAtts) { 
	var theText = "", indentlevel = 0; 
	if (flIncludeAtts === undefined) {
		flIncludeAtts = true;
		}
	function visitSubs (theNode) {
		if (theNode.subs != undefined) {
			for (var i = 0; i < theNode.subs.length; i++) {
				var sub = theNode.subs [i], attstext = "", linetext;
				if (flIncludeAtts) {
					for (var x in sub) {
						if ((x != "subs") && (x != "text") && (x != "parent") && (x != "created")) {
							if (attstext.length > 0) {
								attstext +=  ", ";
								}
							attstext += x + "=" + sub [x];
							}
						}
					if (attstext.length > 0) {
						attstext = " (" + attstext + ")";
						}
					}
				//set linetext
					var linetext = sub.text;
					if (linetext.length > 50) {
						linetext = stringMid (linetext, 1, 50) + "...";
						}
				theText += filledString ("\t", indentlevel) + linetext + attstext + "\n";
				indentlevel++;
				visitSubs (sub);
				indentlevel--;
				}
			}
		}
	visitSubs (theOutline);
	return (theText);
	}
function readOpml (urloutline, callback) { 
	var outlineArray = new Array ();
	var req = request (urloutline);
	var opmlparser = new opmlParser ();
	var metadata = undefined;
	req.on ("response", function (res) {
		var stream = this;
		if (res.statusCode == 200) {
			stream.pipe (opmlparser);
			}
		});
	req.on ("error", function (res) {
		});
	opmlparser.on ("error", function (error) {
		console.log ("readOpml: opml parser error == " + error.message);
		});
	opmlparser.on ("readable", function () {
		var outline;
		while (outline = this.read ()) {
			var ix = Number (outline ["#id"]);
			outlineArray [ix] = outline;
			if (metadata === undefined) {
				metadata = this.meta;
				}
			}
		});
	opmlparser.on ("end", function () {
		var theOutline = new Object ();
		theOutline.parent = undefined; //this is how you can tell you hit the top in a traversal to the summit
		
		//copy elements of the metadata object into the root of the outline
			function copyone (name) {
				var val = metadata [name];
				if ((val !== undefined) && (val != null)) {
					theOutline [name] = val;
					}
				}
			copyone ("title");
			copyone ("datecreated");
			copyone ("datemodified");
			copyone ("ownername");
			copyone ("owneremail");
			copyone ("description");
		
		for (var i = 0; i < outlineArray.length; i++) {
			var obj = outlineArray [i];
			if (obj != null) {
				var idparent = obj ["#parentid"], parent;
				if (idparent == 0) {
					parent = theOutline;
					}
				else {
					parent = outlineArray [idparent];
					}
				if (parent.subs === undefined) {
					parent.subs = new Array ();
					}
				parent.subs [parent.subs.length] = obj;
				obj.parent = parent;
				delete obj ["#id"];
				delete obj ["#parentid"];
				}
			}
		if (callback != undefined) {
			callback (theOutline);
			}
		});
	}
readOpml ("https://dl.dropboxusercontent.com/u/36518280/worldOutline/dave.opml", function (theOutline) {
	console.log (outlineToText (theOutline));
	});