本文档根据以下方面定义了应用程序接口: 提供API服务的组件； 由每个组件提供的功能； 由每个组件提供的接口；和 与组件导出的接口相关联的外部可见行为。 它没有具体说明: 单个实现或产品； 组件的内部设计；和 用于通信的技术。 该文档定义了应用程序接口的那些方面，这些方面对于所有SLE服务类型或SLE服务类型的子集是通用的，例如，所有返回链路服务或所有前向链路服务。它还定义了一个框架来规范API的特定于服务类型的元素。？SLE返回链路服务（参考文献[10]、[11]和[12]）和SLE前向链路服务（参考文献[13]和[14]）的补充推荐实践文档定义了API的特定于服务的方面。应用程序接口的本文档响应了CCSDS SLE传输服务推荐标准对此类API的要求，这些标准在本文档发布时可用。

This document defines the Application Program Interface in terms of:

1. the components that provide the services of the API;
2. the functionality provided by each of the components;
3. the interfaces provided by each of the components; and
4. the externally visible behavior associated with the interfaces exported by the components.

It does not specify:

1. individual implementations or products;
2. the internal design of the components; and
3. the technology used for communications.

This document defines those aspects of the Application Program Interface, which are common for all SLE service types or for a subset of the SLE service types, e.g., all return link services or all forward link services.  It also defines a framework for specification of service type-specific elements of the API.  Service-specific aspects of the API are defined by supplemental Recommended Practice documents for SLE return link services (references [10], [11], and [12]) and SLE forward link services (references [13] and [14]). This document for the Application Program Interface responds to the requirements imposed on such an API by the CCSDS SLE transfer service Recommended Standards that were available when this document was released.