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MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message Bodies

机译:MIME(多用途Internet邮件扩展)第1部分:用于指定和描述Internet邮件正文格式的机制

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STD 11, RFC 822 defines a message representation protocol whichspecifies considerable detail about message headers, but which leavesthe message content, or message body, as flat ASCII text. Thisdocument redefines the format of message bodies to allow multi-parttextual and non-textual message bodies to be represented andexchanged without loss of information. This is based on earlier workdocumented in RFC 934 and STD 11, RFC 1049, but extends and revisesthat work. Because RFC 822 said so little about message bodies, thisdocument is largely orthogonal to (rather than a revision of) RFC822.In particular, this document is designed to provide facilities toinclude multiple objects in a single message, to represent body textin character sets other than US-ASCII, to represent formatted multifonttext messages, to represent non-textual material such as imagesand audio fragments, and generally to facilitate later extensionsdefining new types of Internet mail for use by cooperating mailagents.This document does NOT extend Internet mail header fields to permitanything other than US-ASCII text data. Such extensions are thesubject of a companion document [RFC-1522].This document is a revision of RFC 1341. Significant differencesfrom RFC 1341 are summarized in Appendix H.
机译:STD 11,RFC 822定义了一种消息表示协议,该协议指定了有关消息头的大量详细信息,但将消息内容或消息主体保留为纯ASCII文本。本文档重新定义了消息正文的格式,以允许在不丢失信息的情况下表示和交换多部分文本和非文本消息正文。这是基于RFC 934和STD 11,RFC 1049中记录的早期工作,但是对该工作进行了扩展和修订。因为RFC 822对消息正文的描述很少,所以该文档在很大程度上与RFC822正交(而不是对RFC822进行修订)。特别是,该文档旨在提供在单个消息中包含多个对象的功能,以用除字符集之外的字符集表示正文US-ASCII,用于表示带格式的多字体文本消息,表示诸如图像和音频片段之类的非文本材料,并且通常有助于以后的扩展定义协作邮件代理使用的新型Internet邮件。本文不扩展Internet邮件头字段以允许任何方式除了US-ASCII文本数据。此类扩展是随附文档[RFC-1522]的主题。该文档是RFC 1341的修订版。与RFC 1341的重要区别总结在附录H中。

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