ABL provides built-in data types, built-in class data types, and user-defined class data types. References to built-in data types follow these rules:

• Like most other keywords, references to specific built-in data types appear in all UPPERCASE, using a font that is appropriate to the context; no uppercase reference ever includes or implies any data type other than itself
• Wherever integer appears, this is a reference to the INTEGER or INT64 data type
• Wherever character appears, this is a reference to the CHARACTER, LONGCHAR, or CLOB data type
• Wherever decimal appears, this is a reference to the DECIMAL data type
• Wherever numeric appears, this is a reference to the INTEGER, INT64, or DECIMAL data type

References to built-in class data types appear in mixed case with initial caps, for example, Progress.Lang.Object. References to user-defined class data types appear in mixed case, as specified for a given application example.