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	/** Validate the value for the property. Answer null if valid.
	* Answer the error String if invalid.
	* Override this method to modify the validation behavior.
	* Default is just to use the validator from _getValueValidator.
	* You may change ValueValidator to override the error messages
	* or the generic behavior inherited from PntValueValidator
	* @param prop PntPropertyDescriptor
	* @param value mixed value to be validated.
	* @return String the error string or null if the value is valid
	*/
	function validateGetErrorString(&$prop, $value) {
		$validator =& $this->_getValueValidator($prop);
		return $validator->validate($value);
	}