{
	
	var composition = app.project.activeItem;
	var layers = composition.selectedLayers;
	var properties = composition.selectedProperties;
	var numFrames = Math.floor(composition.duration / composition.frameDuration);
	
	var outputString = ''
	output('<?xml version="1.0" encoding="utf-8"?>');
	output('<data>');
	
	buildFile();
	writeFile();
	
	function buildFile() {
		if (properties.length == 0) {
			alert("No properties selected.");
		}
		else {
			exportProperties();
		}
	}
	
	function output(value) {
		outputString += value + "\r";
	}
	
	function writeFile() {
		output('</data>');
		var file = new File(Folder.desktop.absoluteURI + "/" + "export.txt");
		file.open("w","TEXT","????");
		file.write(outputString);
		file.close();
		file.execute();
	}
	
	function exportProperties() {
		var i = 0;
		var l = numFrames;
		for (; i<l; ++i) {
			var time = i * composition.frameDuration;
			output('	<keyframe frame="' + i + '" time="' + time + '">');
			// build properties list
			var x = 0;
			var y = properties.length;
			var source = [];
			var sourceCount = 0;
			var currentContainer;
			for (; x<y; ++x) {
				if (properties[x].valueAtTime != undefined) {
					var parentName;
					if (properties[x].parentProperty != undefined) {
						parentName = properties[x].parentProperty.name;
					}
					else {
						parentName = "Undefined Property";
					}
					if (source[parentName] == undefined) {
						source[parentName] = {};
						source[parentName].name = properties[x].name;
						source[parentName].values = [];
					}
					source[parentName].values.push(properties[x]);
				}
			}
			// build xml
			for (var pn in source) {
				output('		<source name="' + pn + '">');
				var x = 0;
				var y = source[pn].values.length;
				for (; x<y; ++x) {
					exportProperty(source[pn].values[x], time)
				}
				output('		</source>');
			}
			output('	</keyframe>');
		}
	}
	
	function exportProperty(prop, time) {
		var val = prop.valueAtTime(time, true);
		if (val.length > 1) {
			exportMultiValue(prop, val);
		}
		else {
			exportSingleValue(prop, val);
		}
	}
	
	function exportSingleValue(prop, val) {
		output('			<property name="' + prop.name + '" value="' + val + '"/>');
	}
	
	function exportMultiValue(prop, val) {
		var str = '			<property name="' + prop.name + '"';
		
		var i = 0;
		var l = val.length;
		for (; i<l; ++i) {
			str += ' value' + i + '="' + val[i] + '"';
		}
		
		str += '/>';
		output(str);
	}
	
	function outputObject(obj) {
		var out = "";
		for (var s in obj) {
			out += s + "\n";
		}
		alert(out);
	}

}