信息技术.多媒体中间设备.第5部分:组件下载

[中文适用范围]： ISO/IEC 23004 的这一部分定义了 MPEG 多媒体中间件 (M3W) 技术下载架构。 该定义包含M3W应用程序编程接口（API）中与下载以及实现相关的部分的规范。 M3W API 规范提供了 M3W 提供的下载功能的统一视图。 实现的规范与那些正在实现 M3W 下载框架的人相关。 [外文原描述]： ISO/IEC 23004-5:2008 specifies the interfaces of the support application programming interface (API) and the realization technology used for Component Download in MPEG Multimedia Middleware (M3W). Component Download is an optional framework for M3W Platforms. The goal of this realization technology is to enable controlled download of software components to a device. In this context controlled means that before the actual transfer of the component we are able to assess whether the component actually "fits". ISO/IEC 23004-5:2008 specifies the following entities. Repository - contains components that can be downloaded. Target - enables receiving components. Locator - responsible for locating all the entities (realization of the roles) that participate in a particular download. Decider - assesses the feasibility of a particular download (this can include technical fit, business fit, etc.). Initiator - initiates and coordinates the download process. These entities together enable through different deployments a large number of component download and upload scenarios, varying from point-to-point transfer to broadcast of components.