IPP Mail Archive: IPP> RFC 3470 (BCP 70) Guidelines for use

IPP Mail Archive: IPP> RFC 3470 (BCP 70) Guidelines for use

IPP> RFC 3470 (BCP 70) Guidelines for use of XML in IETF Protocols

From: McDonald, Ira (imcdonald@sharplabs.com)
Date: Thu Jan 23 2003 - 16:22:58 EST

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    Hi folks,

    Excellent reading.

        ftp://ftp.isi.edu/in-notes/rfc3470.txt

    I particularly enjoyed the discussion of XML validation using
    ISO SGML DTD, W3C XML Schema, and OASIS RELAX-NG in section 4.7.

    Cheers,
    - Ira McDonald
      High North Inc
    ----------------------------------
    [excerpts from RFC 3470]

    Abstract

       The Extensible Markup Language (XML) is a framework for structuring
       data. While it evolved from Standard Generalized Markup Language
       (SGML) -- a markup language primarily focused on structuring
       documents -- XML has evolved to be a widely-used mechanism for
       representing structured data.

       There are a wide variety of Internet protocols being developed; many
       have need for a representation for structured data relevant to their
       application. There has been much interest in the use of XML as a
       representation method. This document describes basic XML concepts,
       analyzes various alternatives in the use of XML, and provides
       guidelines for the use of XML within IETF standards-track protocols.

    Table of Contents

       Conventions Used In This Document . . . . . . . . . . . . . . . . 2
       1. Introduction and Overview . . . . . . . . . . . . . . . . . 2
             1.1 Intended Audience. . . . . . . . . . . . . . . . . . . 3
             1.2 Scope . . . . . . . . . . . . . . . . . . . . . . . . 3
             1.3 XML Evolution . . . . . . . . . . . . . . . . . . . . 3
             1.4 XML Users, Support Groups, and Additional
                   Information. . . . . . . . . . . . . . . . . . . . . . 4
       2. XML Selection Considerations . . . . . . . . . . . . . . . . 4
       3. XML Alternatives . . . . . . . . . . . . . . . . . . . . . . 5
       4. XML Use Considerations and Recommendations . . . . . . . . . 7
             4.1 XML Syntax and Well-Formedness . . . . . . . . . . . . 7
             4.2 XML Information Set . . . . . . . . . . . . . . . . . 7
             4.3 Syntactic Restrictions . . . . . . . . . . . . . . . . 8
             4.4 XML Declarations . . . . . . . . . . . . . . . . . . . 9
             4.5 XML Processing Instructions . . . . . . . . . . . . . 9
             4.6 XML Comments . . . . . . . . . . . . . . . . . . . . . 10
             4.7 Validity and Extensibility . . . . . . . . . . . . . . 10
             4.8 Semantics as Well as Syntax. . . . . . . . . . . . . . 12
             4.9 Namespaces . . . . . . . . . . . . . . . . . . . . . . 12
                   4.9.1 Namespaces and Attributes. . . . . . . . . . . . 13
             4.10 Element and Attribute Design Considerations. . . . . . 14
             4.11 Binary Data and Text with Control Characters . . . . . 16
             4.12 Incremental Processing . . . . . . . . . . . . . . . . 16
             4.13 Entity Declarations and Entity References . . . . . . 16
             4.14 External References . . . . . . . . . . . . . . . . . 17
             4.15 URI Processing . . . . . . . . . . . . . . . . . . . . 17
             4.16 White Space . . . . . . . . . . . . . . . . . . . . . 18
             4.17 Interaction with the IANA . . . . . . . . . . . . . . 19
       5. Internationalization Considerations . . . . . . . . . . . . 19
             5.1 Character Sets and Encodings . . . . . . . . . . . . . 19
             5.2 Language Declaration . . . . . . . . . . . . . . . . . 20
             5.3 Other Internationalization Considerations . . . . . . 20
       6. IANA Considerations . . . . . . . . . . . . . . . . . . . . 21
       7. Security Considerations . . . . . . . . . . . . . . . . . . 21
       8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 22
       9. Normative References . . . . . . . . . . . . . . . . . . . . 22
       10. Informative References . . . . . . . . . . . . . . . . . . . 23
       11. Authors' Addresses . . . . . . . . . . . . . . . . . . . . . 27
       12. Full Copyright Statement . . . . . . . . . . . . . . . . . . 28



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