信息技术.多媒体框架(MPEG-21).第15部分:事件报告

[中文适用范围]： 1.1 概述 ISO/IEC 21000 的这一部分规定了 • 如何表达事件报告请求（ER-R），其中包含有关要报告哪些事件、要报告哪些信息以及向谁报告的信息。 • 当满足ER-R 指定的条件时，如何表达由MPEG-21 对等体创建的事件报告(ER)，以响应事件报告请求。 事件报告请求用于指定对等点将生成事件报告并将其发送给接收者的一组条件。 事件报告请求还指定在生成的事件报告中包含哪些信息。 事件报告的范围仅限于 Peer 之间的事件报告，不包括 Peer 内部的事件报告。1.2 文件的组织 ISO/IEC 21000 的这一部分包括九个条款。 第一条提供了规范的范围和组织。 第 2 条至第 5.3 条包含一组参考文献、术语、定义和缩写。 第 6 条介绍了事件报告的高级架构，而第 7 条和第 8 条指定了事件报告请求和事件报告的语法和语义。 然后，第 9 条指定了 ISO/IEC 21000 本部分中经常使用的数据类型。 最后，附件 A 包含第 7 条和第 8 条中定义的描述符的 XML 模式定义，附件 B 和附件 C 提供了事件报告请求的示例和事件报告。 [外文原描述]： ISO/IEC 21000-15:2006 specifies a mechanism to monitor events associated with the manipulation and usage of Digital Items, as defined in ISO/IEC 21000-2, and Peers. Monitoring the usage of audio-visual digital material and gaining insight into the state or capacity of a Peer is an important functionality for many content creation, delivery, adaptation and consumption applications. ISO/IEC 21000-15:2006 specifies a dynamic mechanism which allows Users to create an Event Report Request within a Digital Item which can then be processed by a Peer. Such an Event Report Request specifies the conditions when an Event Report will be first generated and then sent to a (set of) recipient Peer(s). ISO/IEC 21000-15:2006 specifies the syntax and semantics of Event Report Requests (ER-R) and of Event Reports. Syntax and semantics of Event Report Requests (ER-R) Event Report Requests unambiguously specify the nature and conditions under which Event Reports must be sent to the specified recipients, as well as the recipients of the resulting Event Reports. The main parts of an ER-R are Event Report Request Descriptors that provides descriptive information about the Event Report Request itself;an Event Condition Descriptor that specifies a set of conditions that relate to either a Peer (e.g. it's internal time, status, technical capacity) or a Digital Item (if they have been acted upon by, for example, the use of Digital Item Processing) and that trigger the creation of Event Reports;an Event Report Specification that defines how the resulting Event Report should be structured and what information it should contain. Syntax and semantics of Event Reports Upon the occurrence of the Event (as defined by the Event Report Request), a Peer will generate an Event Report, based on details contained within the Event Report Specification. The Event Report can then be sent to the recipient(s) as specified in the ER-R. ISO/IEC 21000-15:2006 further specifies mechanisms to automate the exchange of Event Reports. Event Reports may for instance, embed Event Report Requests that are to be processed upon reception of the Event Report by a Peer. This mechanism allows for Event Reports to be automatically forwarded to another Peer, or for sending back an Acknowledgment of Receipt to the Event Report's originating Peer.