function __isIdDeclaration__(attributeName) {
  // test if attributeName is 'id' (case insensitive)
  return attributeName?(attributeName.toLowerCase() == 'id'):false;
}
@method DOMImplementation._isIdDeclaration - Return true, if attributeName is an id declaration
@author Jon van Noort (jon@webarcana.com.au)
@param  attributeName : string - the attribute name
@return : boolean