Data types

The following list shows all the data types that can be used in DTDL.

Data types

Type	Description
int8	8 bit signed integer
uint8	8 bit unsigned integer
int16	16 bit signed integer
uint16	16 bit unsigned integer
int32	32 bit signed integer
uint32	32 bit unsigned integer
int64	64 bit signed integer
uint64	64 bit unsigned integer
int128	128 bit signed integer
uint128	128 bit unsigned integer
int256	256 bit signed integer
uint256	256 bit unsigned integer
float	32 bit float
double	64 bit float
char	1 byte character
wchar	UTF-16 (LE) character
datetime	FILETIME
string	1 byte character string
wstring	UTF-16 (LE) string
guid	GUID
bsob(size)	binary small object of size 1 to 127 bytes
object	object (an object id or a reference)

Arrays

Every data type including structs (but not lists) can be used in an array. In classes, arrays of variable sizes can be used. In structs and lists, fixed-sized arrays can be used.

Examples:

wstring[] variableSize_StringArray;
uint16[]  variableSize_Uint16Array;

int32[3]  fixedSize_Int32Array;