ISO/IEC 10021-1:2003 情報技術—メッセージ処理システム（MHS）—パート1：システムとサービスの概要 | ページ 2

3.1 オープンシステム相互接続

ISO/IEC 10021 のこの部分では、ISO/IEC 7498-1 で定義されている次の用語を使用しています。

• a)アプリケーション層;
• b)申請プロセス
• c)システムの相互接続を開く。
• d) OSI 参照モデル。

Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, 2.

The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.

ISO/IEC 10021-1 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Telecommunications and information exchange between systems.

This part of ISO/IEC 10021 is technically aligned with ITU-T Recommendation F.400/X.400 (1999) but is not published as identical text.

This second edition cancels and replaces the first edition (ISO/IEC 10021-1:1990), which has been technically revised. It also incorporates Technical Corrigenda 1 to 7 and consolidates Amendment 1:1994.

ISO/IEC 10021 consists of the following parts, under the general title Information technology — Message Handling Systems (MHS):

• Part 1: System and service overview
• Part 2: Overall architecture
• Part 4: Message transfer system — Abstract service definition and procedures
• Part 5: Message store: Abstract service definition
• Part 6: Protocol specifications
• Part 7: Interpersonal messaging system
• Part 8: Electronic Data Interchange Messaging Service
• Part 9: Electronic Data Interchange Messaging System
• Part 10: MHS routing
• Part 11: MHS Routing — Guide for messaging systems managers [Technical Report]

Introduction

This document is one of a set of Recommendations | International Standards for Message Handling. The entire set provides a comprehensive specification for a Message Handling System (MHS) comprising any number of co-operating open systems.

Message Handling Systems and Services enable users to exchange messages on a store-and-forward basis. A message submitted by one user, the originator, is conveyed by the Message Transfer System (MTS), the principal component of a larger Message Handling System (MHS), and is subsequently delivered to one or more additional users, the message's recipients.

An MHS comprises a variety of interconnected functional entities. Message Transfer Agents (MTAs) co-operate to perform the store-and-forward message transfer function. Message Stores (MSs) provide storage for messages and enable their submission, retrieval and management. User Agents (UAs) help users access MHS. Access Units (AUs) provide links to other communication systems and Services of various kinds (e.g., Telematic Services, Postal Services).

This part of ISO/IEC 10021 specifies the overall system and service description of Message Handling capabilities.

1 Scope

This part of ISO/IEC 10021 defines the overall system and service of an MHS and serves as a general overview of MHS.

Other aspects of Message Handling Systems and Services are defined in other parts of ISO/IEC 10021. The structure of ISO/IEC 10021 (all parts) defining the Message Handling System and Services is shown in Table 1.

The technical aspects of MHS are defined in other parts of ISO/IEC 10021. The overall system architecture of MHS is defined in ISO/IEC 10021-2:2003.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in Annex A and the following apply.

3.2 Directory Systems

This part of ISO/IEC 10021 makes use of the following terms defined in ISO/IEC 9594-1:

• a) directory entry;
• b) directory system agent;
• c) Directory System;
• d) directory user agent.This part of ISO/IEC 10021 makes use of the following terms defined in ISO/IEC 9594-2:
• e) attribute;
• f) group;
• g) name.