1范围和应用领域？（？本开放系统互连国际标准的实施和使用要求将ASN.1类型对象标识符的值公开分配给抽象语法和转移语法规范。抽象语法和转移语法的公开规范和命名可在ISO标准或CCITT建议中进行，或在登记机关程序。正在制定登记机关程序规范。 )1.1本国际标准规定了（a）将数据和控制信息从一个演示实体传输到对等演示实体的程序；（b） 通过功能单元选择展示实体使用的程序的方式；（c） 表示协议的结构和编码——用于传输数据和控制信息的数据单元。这些程序的定义是（d）对等演示实体之间通过演示交流进行的交互- 协议数据单元；（e） 在同一系统中，表示实体和表示服务用户之间通过表示服务原语的交换进行交互；（f） 表示实体和会话服务提供者之间通过会话服务原语的交换进行的交互。1.2这些程序在本国际标准的正文中定义，并由附录A中的状态表补充。1.3这些程序适用于支持OSI参考模型表示层且希望在OSI环境中互连的系统之间的通信实例。 1.4本国际标准还规定了实施这些程序的系统的一致性标准。它不包含可用于证明符合性的测试。

1Scope and Field of Application? (?The implementation and use of this International Standard for Open Systems Interconnection requires the public assignment of values of ASN.1 type OBJECT IDENTIFIER to specifications of abstract syntaxes and transfer syntaxes. Public specification and naming of abstract syntaxes and transfer syntaxes can occur in ISO standards or CCITT Recommendations, or under the mechanisms identified in the Registration Authority procedures. A Registration Authority procedures specification is under development.)1.1This International Standard specifies(a) procedures for the transfer of data and control information from one presentation-entity to a peer presentation-entity;(b) the means of selecting, by means of functional units, the procedures to be used by the presentation-entities;(c) the structure and encoding of the presentation-protocol- data-units used for the transfer of data and control information.The procedures are defined in terms of(d) the interactions between peer presentation-entities through the exchange of presentation-protocol-data-units;(e) the interactions between a presentation-entity and the presentation-service-user in the same system through the exchange of presentation-service primitives;(f) the interactions between a presentation-entity and the session-service-provider through the exchange of session-service primitives.1.2These procedures are defined in the main text of this International Standard supplemented by state tables in annex A.1.3These procedures are applicable to instances of communication between systems which support the Presentation Layer of the OSI Reference Model and which wish to interconnect in an OSI environment.1.4This International Standard also specifies conformance criteria for systems implementing these procedures. It does not contain tests which can be used to demonstrate this conformance.