2. 概要
表 1 と表 2 は, ietf-yang-types および ietf-inet-types YANG モジュールで定義される型を一覧にしたものである. 各型について, 型名, 導出元の基本型, およびその型を導入した RFC を示す.
型名および基本型名は YANG 定義の識別子であるため原文のまま保持する.
型の一覧（原文識別子を保持）
2. Overview
Tables 1 and 2 list the types defined in the YANG modules "ietf-yang-
types" and "ietf-inet-types". For each type, the name of the type,
the base type it was derived from, and the RFC introducing the type
is listed.
+=======================+===================+===============+
| Type | Base Type | Introduced in |
+=======================+===================+===============+
| counter32 | uint32 | RFC 6021 |
+-----------------------+-------------------+---------------+
| zero-based-counter32 | uint32 | RFC 6021 |
+-----------------------+-------------------+---------------+
| counter64 | uint64 | RFC 6021 |
+-----------------------+-------------------+---------------+
| zero-based-counter64 | uint64 | RFC 6021 |
+-----------------------+-------------------+---------------+
| gauge32 | uint32 | RFC 6021 |
+-----------------------+-------------------+---------------+
| gauge64 | uint64 | RFC 6021 |
+-----------------------+-------------------+---------------+
| object-identifier | string | RFC 6021 |
+-----------------------+-------------------+---------------+
| object-identifier-128 | object-identifier | RFC 6021 |
+-----------------------+-------------------+---------------+
| date-and-time | string | RFC 6021 |
+-----------------------+-------------------+---------------+
| date | string | RFC 9911 |
+-----------------------+-------------------+---------------+
| date-no-zone | string | RFC 9911 |
+-----------------------+-------------------+---------------+
| time | string | RFC 9911 |
+-----------------------+-------------------+---------------+
| time-no-zone | string | RFC 9911 |
+-----------------------+-------------------+---------------+
| hours32 | int32 | RFC 9911 |
+-----------------------+-------------------+---------------+
| minutes32 | int32 | RFC 9911 |
+-----------------------+-------------------+---------------+
| seconds32 | int32 | RFC 9911 |
+-----------------------+-------------------+---------------+
| centiseconds32 | int32 | RFC 9911 |
+-----------------------+-------------------+---------------+
| milliseconds32 | int32 | RFC 9911 |
+-----------------------+-------------------+---------------+
| microseconds32 | int32 | RFC 9911 |
+-----------------------+-------------------+---------------+
| microseconds64 | int64 | RFC 9911 |
+-----------------------+-------------------+---------------+
| nanoseconds32 | int32 | RFC 9911 |
+-----------------------+-------------------+---------------+
| nanoseconds64 | int64 | RFC 9911 |
+-----------------------+-------------------+---------------+
| timeticks | int32 | RFC 6021 |
+-----------------------+-------------------+---------------+
| timestamp | timeticks | RFC 6021 |
+-----------------------+-------------------+---------------+
| phys-address | string | RFC 6021 |
+-----------------------+-------------------+---------------+
| mac-address | string | RFC 6021 |
+-----------------------+-------------------+---------------+
| xpath1.0 | string | RFC 6021 |
+-----------------------+-------------------+---------------+
| hex-string | string | RFC 6991 |
+-----------------------+-------------------+---------------+
| uuid | string | RFC 6991 |
+-----------------------+-------------------+---------------+
| dotted-quad | string | RFC 6991 |
+-----------------------+-------------------+---------------+
| language-tag | string | RFC 9911 |
+-----------------------+-------------------+---------------+
| yang-identifier | string | RFC 6991 |
+-----------------------+-------------------+---------------+
表 1: "ietf-yang-types" モジュールで定義される型
+=============================+=================+===============+
| Type | Base Type | Introduced in |
+=============================+=================+===============+
| ip-version | enum | RFC 6021 |
+-----------------------------+-----------------+---------------+
| dscp | uint8 | RFC 6021 |
+-----------------------------+-----------------+---------------+
| ipv6-flow-label | uint32 | RFC 6021 |
+-----------------------------+-----------------+---------------+
| port-number | uint16 | RFC 6021 |
+-----------------------------+-----------------+---------------+
| protocol-number | uint8 | RFC 9911 |
+-----------------------------+-----------------+---------------+
| upper-layer-protocol-number | protocol-number | RFC 9911 |
+-----------------------------+-----------------+---------------+
| as-number | uint32 | RFC 6021 |
+-----------------------------+-----------------+---------------+
| ip-address | union | RFC 6021 |
+-----------------------------+-----------------+---------------+
| ipv4-address | string | RFC 6021 |
+-----------------------------+-----------------+---------------+
| ipv6-address | string | RFC 6021 |
+-----------------------------+-----------------+---------------+
| ip-address-no-zone | union | RFC 6991 |
+-----------------------------+-----------------+---------------+
| ipv4-address-no-zone | ipv4-address | RFC 6991 |
+-----------------------------+-----------------+---------------+
| ipv6-address-no-zone | ipv6-address | RFC 6991 |
+-----------------------------+-----------------+---------------+
| ip-address-link-local | union | RFC 9911 |
+-----------------------------+-----------------+---------------+
| ipv4-address-link-local | ipv4-address | RFC 9911 |
+-----------------------------+-----------------+---------------+
| ipv6-address-link-local | ipv6-address | RFC 9911 |
+-----------------------------+-----------------+---------------+
| ip-prefix | union | RFC 6021 |
+-----------------------------+-----------------+---------------+
| ipv4-prefix | string | RFC 6021 |
+-----------------------------+-----------------+---------------+
| ipv6-prefix | string | RFC 6021 |
+-----------------------------+-----------------+---------------+
| ip-address-and-prefix | union | RFC 9911 |
+-----------------------------+-----------------+---------------+
| ipv4-address-and-prefix | string | RFC 9911 |
+-----------------------------+-----------------+---------------+
| ipv6-address-and-prefix | string | RFC 9911 |
+-----------------------------+-----------------+---------------+
| domain-name | string | RFC 6021 |
+-----------------------------+-----------------+---------------+
| host-name | domain-name | RFC 9911 |
+-----------------------------+-----------------+---------------+
| host | union | RFC 6021 |
+-----------------------------+-----------------+---------------+
| uri | string | RFC 6021 |
+-----------------------------+-----------------+---------------+
| email-address | string | RFC 9911 |
+-----------------------------+-----------------+---------------+
表 2: "ietf-inet-types" モジュールで定義される型
一部の型には, Structure of Management Information Version 2 (SMIv2) [RFC2578] [RFC2579] の等価なデータ型がある. 二つのデータ型が同じ値集合を持ち, 値の意味が等価である場合, YANG データ型は SMIv2 データ型と等価である.
表 3 は "ietf-yang-types" YANG モジュールで定義される型と対応する SMIv2 型を示す. 表 4 は "ietf-inet-types" モジュールの型と対応する SMIv2 型を示す.
+=======================+================================+
| YANG type | Equivalent SMIv2 type (module) |
+=======================+================================+
| counter32 | Counter32 (SNMPv2-SMI) |
+-----------------------+--------------------------------+
| zero-based-counter32 | ZeroBasedCounter32 (RMON2-MIB) |
+-----------------------+--------------------------------+
| counter64 | Counter64 (SNMPv2-SMI) |
+-----------------------+--------------------------------+
| zero-based-counter64 | ZeroBasedCounter64 (HCNUM-TC) |
+-----------------------+--------------------------------+
| gauge32 | Gauge32 (SNMPv2-SMI) |
+-----------------------+--------------------------------+
| gauge64 | CounterBasedGauge64 (HCNUM-TC) |
+-----------------------+--------------------------------+
| object-identifier-128 | OBJECT IDENTIFIER |
+-----------------------+--------------------------------+
| centiseconds32 | TimeInterval (SNMPv2-TC) |
+-----------------------+--------------------------------+
| timeticks | TimeTicks (SNMPv2-SMI) |
+-----------------------+--------------------------------+
| timestamp | TimeStamp (SNMPv2-TC) |
+-----------------------+--------------------------------+
| phys-address | PhysAddress (SNMPv2-TC) |
+-----------------------+--------------------------------+
| mac-address | MacAddress (SNMPv2-TC) |
+-----------------------+--------------------------------+
| language-tag | LangTag (LANGTAG-TC-MIB) |
+-----------------------+--------------------------------+
表 3: "ietf-yang-types" モジュールに対応する SMIv2 型
+=================+===============================================+
| YANG type | Equivalent SMIv2 type (module) |
+=================+===============================================+
| ip-version | InetVersion (INET-ADDRESS-MIB) |
+-----------------+-----------------------------------------------+
| dscp | Dscp (DIFFSERV-DSCP-TC) |
+-----------------+-----------------------------------------------+
| ipv6-flow-label | IPv6FlowLabel (IPV6-FLOW-LABEL-MIB) |
+-----------------+-----------------------------------------------+
| port-number | InetPortNumber (INET-ADDRESS-MIB) |
+-----------------+-----------------------------------------------+
| as-number | InetAutonomousSystemNumber (INET-ADDRESS-MIB) |
+-----------------+-----------------------------------------------+
| uri | Uri (URI-TC-MIB) |
+-----------------+-----------------------------------------------+
表 4: "ietf-inet-types" モジュールに対応する SMIv2 型