Trying to read xml file

Trying to read xml file

In PHP I am querying my database and creating a XML document. that has the following layout.
<markers>
      <mark traffic="" latitude ="" longitude =""></mark>
      <mark traffic="" latitude ="" longitude =""></mark>
</markers>
I have created the following code trying to read these attributes to display into google maps here is my Jquery

       $.get('/PHP/SQL_Maindata.PHP', function(d){ $(d).find('marker').each(function()
            {
                  //gets Google LatLng
                  var latlng = new google.maps.LatLng($(this).attr('latitude'),$(this).attr('longitude')); 
                  var myMarker = new google.maps.Marker({position: latlng,map: map,title:$(this).attr('traffic')});
           
              });
            });