// create a new XML document
$doc = new DomDocument('1.0');
$doc->formatOutput = TRUE;

// create root node
$root = $doc->createElement('root');
$root = $doc->appendChild($root);

// process one row at a time
while($row = mysql_fetch_assoc($dbresult)) {

  // add node for each row
  $occ = $doc->createElement($table1_id);
  $occ = $root->appendChild($occ);

  // add a child node for each field
  foreach ($row as $fieldname => $fieldvalue) {

    $child = $doc->createElement($fieldname);
    $child = $occ->appendChild($child);

    $value = $doc->createTextNode(utf8_encode($fieldvalue));//++iso-8859-1....
    $value = $child->appendChild($value);
	
  } // foreach
} // while


// get completed xml document
$xml_string = $doc->saveXML();

// save xml document
$ourFileName = "XML_document.xml";
$ourFileHandle = fopen($ourFileName, 'w') or die("can't open file");
fwrite($ourFileHandle,$xml_string);
fclose($ourFileHandle);