Data Types

The data types that can be interpreted as character-type in a UP include:

C: Character (letters, numbers, special characters)
N: Numeric character (numbers)
D: Date
T: Time
STRING: Character string
Character-type structures: Structures which either directly or in substructures contain only fields of types C, N, D or T

In an NUS, a character of this type has a length of 1 byte, and in a US a length corresponding to the length of one character on the relevant platform. The data type W is no longer supported.

Variables of the types X and XSTRING are called byte-type. The main characteristics of the different kinds of structures are:

Flat structures contain only fields of the elementary types C, N, D, T, F, I, P, and X, or structures containing these types.

Deep structures contain strings, internal tables and field or object references in addition to the elementary types.
Nested structures are structures that contain substructures as components.
Non-nested structures are structures that do not contain any substructures.