Built-in Types

Like many programming languages, YANG has a set of built-in types, but differs in terms of special requirements from the management domain. Table 1 summarizes the built-in types.

**Table 1** Built-in types
Type Name	Description
binary	Any binary data
bits	Set of bits or flags
boolean	"true" or "false"
decimal64	64-bit signed decimal number
empty	Leaf node without a value
enumeration	Enumerated strings
identityref	Reference to an abstract identity
instance-identifier	Reference to a data tree node
int8	8-bit signed integer
int16	16-bit signed integer
int32	32-bit signed integer
int64	64-bit signed integer
leafref	Reference to a leaf instance
string	Human-readable string
uint8	8-bit unsigned integer
uint16	16-bit unsigned integer
uint32	32-bit unsigned integer
uint64	64-bit unsigned integer
union	Choice of member types