Network Working Group J. Collins
Request for Comments: 3073 Bitstream Inc.
Category: Informational March 2001
Network Working Group J. Collins
Request for Comments: 3073 Bitstream Inc.
Category: Informational March 2001
Portable Font Resource (PFR) - application/font-tdpfr MIME Sub-type Registration
可移植字体资源（PFR）-应用程序/字体tdpfr MIME子类型注册
Status of this Memo
本备忘录的状况
This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
本备忘录为互联网社区提供信息。它没有规定任何类型的互联网标准。本备忘录的分发不受限制。
Copyright Notice
版权公告
Copyright (C) The Internet Society (2001). All Rights Reserved.
版权所有（C）互联网协会（2001年）。版权所有。
Abstract
摘要
This document describes the registration of the Multipurpose Internet Mail Extensions (MIME) sub-type application/font-tdpfr. The encoding is defined by the PFR Specification.
本文档描述了多用途Internet邮件扩展（MIME）子类型应用程序/font tdpfr的注册。编码由PFR规范定义。
A Portable Font Resource (PFR) contains a set of glyph shapes. Each glyph shape is associated with a character code. The PFR format is designed to be both compact and platform-independent. It is intended to facilitate accurate rendering of fonts in all environments whether or not they have the required fonts already installed.
可移植字体资源（PFR）包含一组字形形状。每个字形形状都与一个字符代码相关联。PFR格式的设计既紧凑又独立于平台。它旨在帮助在所有环境中准确呈现字体，无论它们是否已安装所需的字体。
The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC-2119 [REQ].
本文件中的关键词“必须”、“不得”、“要求”、“应”、“不得”、“应”、“不应”、“建议”、“可”和“可选”应按照RFC-2119[REQ]中所述进行解释。
This document describes the registration of the MIME sub-type application/font-tdpfr. The encoding is defined by [PFR].
本文档介绍MIME子类型应用程序/font tdpfr的注册。编码由[PFR]定义。
PFR (Portable Font Resource) is defined by Bitstream Inc. in [PFR]. The documentation can be obtained from Bitstream at:
PFR（便携式字体资源）由Bitstream Inc.在[PFR]中定义。文档可从Bitstream获得，网址为：
Bitstream Inc. 215 First Street Cambridge MA 02142 U.S.A. Phone: +1 617 497 6222 Fax: +1 617 868 0784
Bitstream Inc.美国剑桥第一街215号02142电话：+1 617 497 6222传真：+1 617 868 0784
A copy of this specification can also be found at:
本规范的副本也可在以下网址找到：
http://www.bitstream.com/pfrspec/index.html
http://www.bitstream.com/pfrspec/index.html
While a brief scope and feature description is provided in this section as background information, the reader is directed to the original PFR specification [PFR] to obtain complete feature and technical details.
虽然本节提供了简要的范围和特性描述作为背景信息，但读者可参考原始PFR规范[PFR]，以获得完整的特性和技术细节。
A PFR contains a set of glyph shapes. Each glyph shape is associated with a character code. The PFR format is designed to be both compact and platform-independent. It is intended to facilitate accurate rendering of fonts in environments whether or not they have the required fonts already installed.
PFR包含一组字形形状。每个字形形状都与一个字符代码相关联。PFR格式的设计既紧凑又独立于平台。它旨在帮助在环境中准确呈现字体，无论环境是否已安装所需的字体。
The glyph shape definitions in a PFR are resolution-independent. This allows glyph definitions to be displayed or printed on devices with a wide variety of resolutions. It also allows glyphs to be rendered at any size.
PFR中的轮廓形状定义与分辨率无关。这允许在具有多种分辨率的设备上显示或打印字形定义。它还允许以任何大小渲染glyph。
Some of the features of the PFR format are:
PFR格式的一些功能包括：
- Compact representation of glyph shapes
- 字形形状的紧凑表示
- Independent of byte order and operating system
- 独立于字节顺序和操作系统
- Independent of output device resolution
- 独立于输出设备分辨率
- Fully scalable to any glyph size
- 完全可扩展到任何字形大小
- Optional inclusion of bitmap glyph images
- 可选包含位图图示符图像
- Adopted as the font standard by DAVIC, DVB, and DTG
- 作为DAVIC、DVB和DTG的字体标准采用
This document is submitted by J. Collins, Bitstream Inc. All comments should be directed to <jcollins@bitstream.com>.
本文件由J.Collins，Bitstream Inc.提交。所有评论均应发送至<jcollins@bitstream.com>.
The PFR media type has been previously registered with IANA as application/vnd.truedoc. In view of its subsequent widespread adoption as a standard font format by multiple standards bodies who have relationships with the Internet community, Bitstream has been asked to re-register this media type within the IETF tree.
PFR介质类型之前已在IANA注册为application/vnd.truedoc。鉴于与互联网社区有关系的多个标准机构随后广泛采用Bitstream作为标准字体格式，Bitstream已被要求在IETF树中重新注册此媒体类型。
To: ietf-types@iana.org Subject: Registration of Standard MIME Media type application/font-tdpfr
致：ietf-types@iana.org主题：注册标准MIME媒体类型应用程序/font tdpfr
MIME media type name: application
MIME媒体类型名称：应用程序
MIME subtype name: font-tdpfr
MIME子类型名称：字体tdpfr
Required parameters: none
所需参数：无
Optional parameters: none
可选参数：无
Encoding considerations: Binary or base 64 required
编码注意事项：需要二进制或基数64
Security considerations:
安全考虑：
PFR uses a structure that can store glyph image data and encoding arrays. The fields defined in the PFR specification are of a descriptive nature and provide information that is useful to facilitate viewing and rendering of glyph images by a recipient. As such, the fields currently defined in the PFR specification do not in themselves create additional security risks, since the fields are not used to induce any particular behavior by the recipient application.
PFR使用一种可以存储字形图像数据和编码数组的结构。PFR规范中定义的字段具有描述性，并提供有助于接收者查看和呈现字形图像的信息。因此，PFR规范中当前定义的字段本身不会产生额外的安全风险，因为这些字段不用于诱导接收方应用程序的任何特定行为。
PFR has an extensible structure, so that it is theoretically possible that fields could be defined in the future which could be used to induce particular actions on the part of the recipient, thus presenting additional security risks, but this type of capability is not supported in the referenced PFR specification. Indeed, the definition of fields that would include such processing instructions is inconsistent with the goals and spirit of the PFR specification.
PFR具有可扩展的结构，因此理论上可以在将来定义字段，这些字段可用于诱导接收方的特定操作，从而带来额外的安全风险，但参考的PFR规范不支持这种类型的功能。事实上，包含此类处理指令的字段定义与PFR规范的目标和精神不一致。
Interoperability considerations: none
互操作性注意事项：无
Published specification:
已发布的规范：
The specification for this content type is available on request from:
此内容类型的规范可从以下地址索取：
Bitstream Inc. 215 First Street Cambridge MA 02142 U.S.A. Phone: +1 617 497 6222 Fax: +1 617 868 0784
Bitstream Inc.美国剑桥第一街215号02142电话：+1 617 497 6222传真：+1 617 868 0784
A copy of this specification can also be found at:
本规范的副本也可在以下网址找到：
http://www.bitstream.com/pfrspec/index.html
http://www.bitstream.com/pfrspec/index.html
Applications which use this media type:
使用此媒体类型的应用程序：
Netscape Communicator, Bitstream WebFont Maker, Hexmac Typograph
Netscape Communicator、Bitstream WebFont Maker、Hexmac排版
Additional information: None
其他信息：无
Magic number(s): 50 46 52 30 hex
魔法数字：50 46 52 30十六进制
File extension(s): PFR
文件扩展名：PFR
Macintosh File Type Code(s): Creator: 'b$pw' Type: 'PFR '
Macintosh File Type Code(s): Creator: 'b$pw' Type: 'PFR '
Person to contact for further information:
欲了解更多信息，请联系：
"John Collins" <jcollins@bitstream.com>
"John Collins" <jcollins@bitstream.com>
Intended usage: common
预期用途：普通
Author/Change controller:
作者/变更控制员：
"John Collins" <jcollins@bitstream.com>
"John Collins" <jcollins@bitstream.com>
[REQ] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
[REQ]Bradner，S.，“在RFC中用于指示需求水平的关键词”，BCP 14，RFC 2119，1997年3月。
[MIME1] Freed, N. and N. Borenstein, "Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies", RFC 2045, November 1996.
[MIME1]Freed，N.和N.Borenstein，“多用途Internet邮件扩展（MIME）第一部分：Internet邮件正文格式”，RFC 20451996年11月。
[MIME4] Freed, N. and N. Borenstein, "Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures", RFC 2048, November 1996.
[MIME4]Freed，N.和N.Borenstein，“多用途互联网邮件扩展（MIME）第四部分：注册程序”，RFC 20481996年11月。
[PFR] Bitstream Inc. "PFR Specification",
http://www.bitstream.com/pfrspec/index.html
[PFR] Bitstream Inc. "PFR Specification",
http://www.bitstream.com/pfrspec/index.html
John Collins Bitstream Inc. 215 First Street Cambridge, MA 02142
约翰·柯林斯比特流公司，马萨诸塞州剑桥第一街215号，邮编02142
Phone: +1 617 520 8401
Fax: +1 617 868 0784
EMail: jcollins@bitstream.com
Phone: +1 617 520 8401
Fax: +1 617 868 0784
EMail: jcollins@bitstream.com
Copyright (C) The Internet Society (2001). All Rights Reserved.
版权所有（C）互联网协会（2001年）。版权所有。
This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English.
本文件及其译本可复制并提供给他人，对其进行评论或解释或协助其实施的衍生作品可全部或部分编制、复制、出版和分发，不受任何限制，前提是上述版权声明和本段包含在所有此类副本和衍生作品中。但是，不得以任何方式修改本文件本身，例如删除版权通知或对互联网协会或其他互联网组织的引用，除非出于制定互联网标准的需要，在这种情况下，必须遵循互联网标准过程中定义的版权程序，或根据需要将其翻译成英语以外的其他语言。
The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns.
上述授予的有限许可是永久性的，互联网协会或其继承人或受让人不会撤销。
This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
本文件和其中包含的信息是按“原样”提供的，互联网协会和互联网工程任务组否认所有明示或暗示的保证，包括但不限于任何保证，即使用本文中的信息不会侵犯任何权利，或对适销性或特定用途适用性的任何默示保证。
Acknowledgement
确认
Funding for the RFC Editor function is currently provided by the Internet Society.
RFC编辑功能的资金目前由互联网协会提供。