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LoadXML error in doXPath

My Code:

NB - pButtonToken is either "open" or "close"

------------------------------------------------------------

var answer = confirm("Please confirm that you wish to " + pButtonToken + " the selected surveys.");                    

selectedRows = objsurveyList.getCheckedRows(0);

endpoint = "/ajax/setProgramOpenClose.php"
parms = "pgmId="+selectedRows+"&action="+pButtonToken;
                
if (answer){
                    
    var loader = dhtmlxAjax.postSync(endpoint, parms);

    console.log(loader.xmlDoc.responseXML);
    console.log(loader.xmlDoc.responseText)
                    
    var result = loader.doXPath("/");

    for(var i=0;i<result.length;i++){
        console.log(result[i].nodeName);
    }
                                    
}

------------------------------------------------------------

From the console (via Firebug):

loader.xmlDoc.responseXML = null
loader.xmlDoc.responseText = <?xml version="1.0" encoding="ISO-8859-1"?> <result><value>1</value><message>Changes sucessfully made.</message></result>

Upon running I consistently get:

Error type: LoadXML
Description: Incorrect XML

in a JS alert type popup.

You were exactly correct. I omitted the following code from my PHP:

if (stristr($_SERVER["HTTP_ACCEPT"],"application/xhtml+xml")) {
      header("Content-type: application/xhtml+xml");
} else {
      header("Content-type: text/xml");
}