jquery ajax how to know the return data is xml or html? -

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how can know/ test return data jquery ajax xml, html or plain text?

for instance, have these 2 types of data want handle.

xml,

<?xml version="1.0"?> <xml><response><error elementid="accept_terms_conditions" message="field 'agree terms &amp; conditions' needs filled."/></response></xml>

html,

<form action="http://xxx/booking.php" method="post" enctype="multipart/form-data" class="item-form border-top-bottom"> ... </form>

jquery,

$(".button-submit").click(function(){      var form = $(this).closest("form");     var url = form.attr("action");      // load article object.     $.ajax({         type: "post",         //datatype: "html",         url: url,         data:form.serialize(),         context:$(".holder-form-book-online"),         async: false,         beforesend: function() {             //         },         success: function (returndata) {                   if(returndata.isxml) alert("xml");                  if(returndata.ishtml) alert("html");          }      }).fail(function() {              alert("error");      });      return false;  });

so, 

if(returndata.isxml) alert("xml"); if(returndata.ishtml) alert("html");

is possible?

 var conttype = returndata.getresponseheader ("content-type");  if(conttype == "") { // take here... }

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