4 DAE overview DAE 概述
This specification builds on the capability model defined in CEA-2014[CEA-2014-A] in order to expose to an IPTV service provider the capabilities of any particular OITF.
In addition to what is defined in CEA-2014, other terminal capabilities are defined in section 9.3 covering most of the features defined in this specification. This document does not define whether these capabilities are mandatory or not. Other documents or specifications need to address that. A small minimum set of capabilities are defined in section 9.2 "Default UI profiles".
Section 3.1 of this document defines how to interpret [RFC2119] terms like "SHALL" in sections of this document included in a capability. In sections of this document which are not covered by capabilities, terms like "SHALL" apply as used in each section.
此規範建立在CEA-2014[CEA-2014-A]中定義的能力模型之上，用來將任何特定OITF功能集開放給IPTV服務提供商。
除CEA-2014定義的之外，規範中大部分的功能在9.3節中定義，其中涵蓋了其它所有的終端能力功能定義。此文檔不定義這些功能（能力集）是否強制實現。其它文檔或規範需要解決此問題。最小功能集合在9.2節（Default UI profiles默認用戶接口配置）中定義。
文中3.1節定義瞭如何解釋RFC2119中的一些條目，如SHALL適合在各章節中出現。（不太會翻譯）
【注意：RFC2119是專門用來講諸如MUST,SHOULD,MAY BE等詞含義的文檔，估計此處就是強調一下】
4.1 Architecture of DAE
DAE的體系
This section will introduce the basic concepts in the architecture of the DAE specification and their relationships. [CEA-2014-A] is the baseline technology for the DAE. In particular the following requirements hold:
- The OITF SHALL support the i-Box model as defined in [CEA-2014-A] with the changes described in Annex B of this document, in particular all requirements for an i-Box remote UI client as defined in section 5.1.2 and sections 5.2 through 5.10 of CEA-2014-A (i.e. all Remote UI client requirements inside the subsections that are marked as either “Mandatory for every RUIC” or “Mandatory for i-Box” except where modified by Annex B of this document).
This also includes (through reference) Annexes C, F, G, H, I of [CEA-2014-A]. The OITF SHALL also support the
following features which are not mandatory for the i-box model.
o 5.6.1 Multicast notifications
o 5.7.1 Streamed A/V Content
o 5.7.3 Full-screen video
- The OITF MAY support the 2-box and/or 3-box models defined in [CEA-2014-A]. Note that by default the interface
with the AG and IG deviates from CEA-2014’s 2-box model and 3-box model. An overview of these differences is
given in Section 4.1.1.
- A mandatory requirement in CEA-2014-A remains mandatory for the OITF, and recommended and optional
requirements in CEA-2014-A remain recommended and optional for the OITF, unless explicitly specified differently
inside this DAE specification. A detailed description of these differences can be found in Annex B.
本節中將DAE體系的基本概念以及它們之間的關係。[CEA-2014-A] 是DAE的基礎標準，詳細描述如下：
-OITF需要支持CEA-2014-A規範中定義的i-Box模式，在此文檔附錄B中將會對某些變化進行描述，i-Box遠程UI客戶端的詳細需求在CEA-2014-A的5.1.2節，5.2—5.10節中描述（例如：all Remote UI client requirements inside the subsections that are marked as either “Mandatory for every RUIC” or “Mandatory for i-Box” except where modified by Annex B of this document這一句估計需要看看CEA標準再說）。這些也包含在CEA-2014-A文檔的附件C,F,G,I,H中。OITF也需要支持如下的在i-Box模型中沒有定義的特徵：
·5.6.1 Multicast notifications 多播通知？
·5.7.1 音視頻流媒體內容
·5.7.3 全屏幕視頻
-OITF可選支持CEA標準中定義的2-box，3-box模型.需要注意的是默認情況下，AG,IG接口與CEA中2，3-box 模型中定義的有所不同，在4.1.1節中將描述這些差異。
-CEA中的強制要求仍然作爲OITF中的強制要求存在，同樣的，推薦和可選支持也仍繼承到OITF中，除非在DAE中明確說明的不同以外，在附錄B中對這些差異進行了詳細描述。