/** Gets the oids of the objects corresponding to the items that where marked by the user
	* in the ItemsTableForm of pages like ObjectIndexPage, ObjectPropertyPage and ObjectSearchpage
	* @param Array $requestData with data like $_REQUEST
	* @return Array of String the oids
	*/
	function getMarkedOids($requestData) {
		$result = array(); // php may crash if reference to unitialized var is returned
		$oidParams = $this->getMarkedItemParams($requestData);
		$patternLength = strLen($this->pattern);
		foreach ($oidParams as $key => $ignoored)
			$result[] = substr($key, $patternLength, strLen($key) - 3);
		return $result;
	}