About Tags and the Project Database Choosing the Tag Data Type Another consideration when designing a tag is what type of data the tag will receive. IWS recognizes the following, standard tag data types : • Boolean ( one bit ): Simple boolean with the possible values of 0 (false) and 1 (true). Equivalent to the "bool" data type in C++. Typically used for turning objects off and on or for closing and opening objects. • Integer ( four bytes ): Integer number (positive, negative, or zero) internally stored as a signed 32-bit. Equivalent to the "signed long int" data type in C++. Typically used for counting whole numbers or setting whole number values. Examples: 0 , 5 , −200 .
• Real ( floating point, eight bytes ): Real number that is stored internally as a signed 64-bit. Equivalent to the "double" data type in C++. Typically used for measurements or for decimal or fractional values. • String ( alphanumeric data, up to 1024 characters ): Character string up to 1024 characters that holds letters, numbers, or special characters. Supports both ASCII and UNICODE characters. Examples: Recipe product X123 , 01/01/90 , *** On *** . You can also assign a new tag to a class that you have previously created. You can find these tag types (and their respective icons) in the Global tab of the Project Explorer . Page 49