4.2.4. 内置类型
YANG有一套内置的类型，类似于许多编程语言，但由于网络管理的特殊要求，有一些不同之处。 下表总结了第9节讨论的内置类型：
| 名称 | 描述 |
|---|---|
| binary | 任何二进制数据 |
| bits | 一组比特(bits)或标志(flags) |
| boolean | "true" 或 "false" |
| decimal64 | 64位有符号十进制数字 |
| empty | 一个叶子，没有任何值 |
| enumeration | 枚举的一组字符串之一 |
| identityref | 对抽象身份的引用 |
| int8 | 8位有符号整数 |
| int16 | 16位有符号整数 |
| int32 | 32位有符号整数 |
| int64 | 64位有符号整数 |
| leafref | 对叶子实例的引用 |
| string | 一个字符串 |
| uint8 | 8位无符号整数 |
| uint16 | 16位无符号整数 |
| uint32 | 32位无符号整数 |
| uint64 | 64位无符号整数 |
| union | 成员类型的选择 |
下面是原始内置类型总结表
+---------------------+-------------------------------------+
| Name | Description |
+---------------------+-------------------------------------+
| binary | Any binary data |
| bits | A set of bits or flags |
| boolean | "true" or "false" |
| decimal64 | 64-bit signed decimal number |
| empty | A leaf that does not have any value |
| enumeration | One of an enumerated set of strings |
| identityref | A reference to an abstract identity |
| instance-identifier | A 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 | A reference to a leaf instance |
| string | A character 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 |
+---------------------+-------------------------------------+
“type”声明在第7.4节中介绍。