ExpressionOperation::getAllDescriptions

static function getAllDescriptions()
{
	if(!self::$descriptions)
	{
		self::includeModuleFile();

		self::$descriptions = array(
			self::SUM_OPERATION => GetMessage('CRM_DATA_EXPR_SUM'),
			self::DIFF_OPERATION => GetMessage('CRM_DATA_EXPR_DIFF'),
			self::PERCENT_OPERATION => GetMessage('CRM_DATA_EXPR_PC')
		);
	}
	return self::$descriptions;
}