schema check 
<br>
<?
$xml_file = 'activityWrite.xml';
$xsd_file = 'activity.xsd';
$xml_dom = new DOMDocument;
if(!$xml_dom->load($xml_file)) die("Unable to find $xml_file ");
if(!$xml_dom->schemaValidate($xsd_file)) die('Schema does not match XML file!');
if($xml_dom->schemaValidate($xsd_file)) print "Validated schema xsd file = $xsd_file against xml file = $xml_file ";
?>