public function setCustomProperty($sName, $mValue)
	{
		if (trim($sName) == self::APPLE_RESERVED_NAMESPACE) {
			throw new ApnsPHP_Message_Exception(
				"Property name '" . self::APPLE_RESERVED_NAMESPACE . "' can not be used for custom property."
			);
		}
		$this->_aCustomProperties[trim($sName)] = $mValue;
	}