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| Connection | The Connection type is used to describe by programming one or more connections to external databases (HFSQL Client/Server, Native Access, ...). |
| Date | The Date type allows you to easily handle the dates. This type is used to manage the conversions almost automatically |
| DateTime | The DateTime type allows you to easily handle a date and a time. The DateTime type can be used to perform calculations (subtraction, addition, ...) on the dates, times and durations. |
| API description | An API Description variable is used to describe an API, its parameters, its return value and its calling options by programming. |
| File description | A File description variable is used to describe one or more data files by programming. The description of each file is validated by HDescribeFile. |
| FullTextIndex description | A FullTextIndex description variable is used to describe one or more full-text indexes by programming. |
| Link description | A Link description variable is used to describe a link between two data files by programming. The description of each link is validated by HDescribeLink. |
| Procedure description | The Procedure description type is used to get information about a procedure or a method. |
| Item description | An Item description variable is used to describe by programming one or more items found in a data file. The description of each item is validated by HDescribeItem. |
| Duration | The Duration type is used to easily handle the intervals of dates and times. The DateTime type can be used to perform calculations (subtraction, addition, ...). |
| Queue | A queue variable is a structured type that is used to group a set of elements of same type. The elements are added at the end of queue and they are retrieved in enqueue order. |
| Time | The Time type is used to easily handle the times. This type is used to manage the conversions almost automatically (TimeToString, TimeToInteger, ...) |
| List | A List variable is a structured type that is used to group a set of elements of the same type. The elements can be added at the end of the list or they can be inserted into the list. |
| Stack | A Stack variable is a structured type that is used to group a set of elements of the same type. The elements are added at the end of stack and they are retrieved from the most recent one. |
 Versions 21 and laterPoint | A Point variable is a structured type that is used to represent a position (X, Y) in 2 dimensions. |
| Font | The Font type enables you to easily describe a font by programming. |
| Rectangle | A Rectangle variable is a structured type that is used to represent a rectangle (X, Y, Width, Height) in 2 dimensions. |
| Data source | A Data source variable is used to describe a data source by programming (query, view, alias, ... ).
All the operations that can be performed on a view (or on a query) can be performed on a Data source variable associated with a view (or with a query). |
| Variant | The Variant type is used to:- store any simple value: boolean, numeric (currency, 8-byte real, signed 4-byte integer), characters and character string, date (Date, Time, DateTime and Duration).
- perform interactions with the ActiveX objects and the Automation programming.
- handle the NULL value in WLanguage.
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