nao estou a conseguir por o mapa de goog a funcionar

não estou a conseguir por o mapa da google a  funcionar o que estou  a fazer de errado

segue-se o codigo

foreach ($servicos->getnomeempresa($m['nome'])as $emp):

 $dom = new DOMDocument("1.0");
 echo $emp['nome'];

$node = $dom->createElement("markers");
$parnode = $dom->appendChild($node);
$node = $dom->createElement("marker");
 $newnode = $parnode->appendChild($node);
 $newnode->setAttribute("name", $emp['nome']);
 $newnode->setAttribute("address", $emp['morada']);
 $newnode->setAttribute("lat", $emp['lat']);
 $newnode->setAttribute("lng", $emp['lng']);
 $newnode->setAttribute("type",$emp['type']);
 echo $dom->saveXML();
endforeach;

//$xmlfile = $doc->dump_mem();

?>
 <script>
 var customLabel = {
 restaurant: {
 label: 'R'
 },
 bar: {
 label: 'B'
 }
 };

 function initMap() {
 var map = new google.maps.Map(document.getElementById('map'), {
 center: new google.maps.LatLng(-33.863276, 151.207977),
 zoom: 12
 });
 var infoWindow = new google.maps.InfoWindow;

 // Change this depending on the name of your PHP or XML file
 downloadUrl('https://storage.googleapis.com/mapsdevsite/json/mapmarkers2.xml', function(data) {
 var xml = data.responseXML;
 var markers = xml.documentElement.getElementsByTagName('marker');
 Array.prototype.forEach.call(markers, function(markerElem) {
 var name = markerElem.getAttribute('name');
 var address = markerElem.getAttribute('address');
 var type = markerElem.getAttribute('type');
 var point = new google.maps.LatLng(
 parseFloat(markerElem.getAttribute('lat')),
 parseFloat(markerElem.getAttribute('lng')));

 var infowincontent = document.createElement('div');
 var strong = document.createElement('strong');
 strong.textContent = name
 infowincontent.appendChild(strong);
 infowincontent.appendChild(document.createElement('br'));

 var text = document.createElement('text');
 text.textContent = address
 infowincontent.appendChild(text);
 var icon = customLabel[type] || {};
 var marker = new google.maps.Marker({
 map: map,
 position: point,
 label: icon.label
 });
 marker.addListener('click', function() {
 infoWindow.setContent(infowincontent);
 infoWindow.open(map, marker);
 });
 });
 });
 }

 function downloadUrl(url, callback) {
 var request = window.ActiveXObject ?
 new ActiveXObject('Microsoft.XMLHTTP') :
 new XMLHttpRequest;

 request.onreadystatechange = function() {
 if (request.readyState == 4) {
 request.onreadystatechange = doNothing;
 callback(request, request.status);
 }
 };

 request.open('GET', url, true);
 request.send(null);
 }

 function doNothing() {}
 </script>

	 

	classe serviços

public function getnomeempresa($id){
	$servicos3 = $this->_db->query("SELECT * FROM empresa where nome='$id';");
return $servicos3->fetchAll();
}