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Entity support in XML parsers (was: UTF-8+names)

• To: Bob Foster <bob@o...>
• Subject: Entity support in XML parsers (was: UTF-8+names)
• From: John Cowan <cowan@m...>
• Date: Sun, 19 Oct 2003 19:07:16 -0400
• Cc: Tim Bray <tbray@t...>, Miles Sabin <miles@m...>,xml-dev@l...
• In-reply-to: <1a8f01c3968d$3514b310$6601a8c0@snobird>
• References: <20031019034635.91162.qmail@w...> <3F92A169.60903@p...> <20031019171750.GI20059@m...> <200310192101.05193.miles@m...> <3F92F00E.50603@t...> <1a8f01c3968d$3514b310$6601a8c0@snobird>
• User-agent: Mutt/1.3.28i

Bob Foster scripsit:

> XML does not require parsers to support entities apart from validation

ObMemeStomping:  This is not true.  XML processors, validating or not,
must support internal entities that are defined in the internal subset.

Something I've long wanted to see is a tool that takes a full DTD
and squashes it down to the bare minimum required for use as an internal
subset to preserve all DTD infoset effects but *not* validity.  In
particular:

1) Expand all parameter entities and eliminate all parameter entity
   declarations

2) Eliminate all attribute declarations that are CDATA and either #IMPLIED
   or #REQUIRED

3) Eliminate all element declarations that are ANY, EMPTY, or mixed content,
   and simplify all element-content ones to <!ELEMENT foo (foo)> or
   something of the sort

A reasonable implementation strategy would be to start with James Clark's
DTDinst program (http://www.thaiopensource.com/relaxng/dtdinst) and
then use XSLT (with text output mode) to generate the new DTD.

Anyone interested in tackling it?

-- 
In politics, obedience and support      John Cowan <jcowan@r...>
are the same thing.  --Hannah Arendt    http://www.ccil.org/~cowan

• Follow-Ups:
  • Re: Entity support in XML parsers (was: UTF-8+names)
    • From: "Bob Foster" <bob@o...>

• References:
  • Re: UTF-8+names
    • From: Mike Champion <mc@x...>
  • Re: UTF-8+names
    • From: Bill de hÓra <bill.dehora@p...>
  • Re: UTF-8+names
    • From: John Cowan <cowan@m...>
  • Re: UTF-8+names
    • From: Miles Sabin <miles@m...>
  • Re: UTF-8+names
    • From: Tim Bray <tbray@t...>
  • Re: UTF-8+names
    • From: "Bob Foster" <bob@o...>

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