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Re: DTD parameter entities

• To: "Karl Waclawek" <karl@w...>
• Subject: Re: DTD parameter entities
• From: Toni Uusitalo <toni.uusitalo@p...>
• Date: Thu, 22 Apr 2004 01:39:08 +0200
• Cc: xml-dev@l...
• In-reply-to: <00c701c427e6$3adf71a0$9e539696@citkwaclaww2k>
• References: <6.0.0.22.0.20040421212252.02130b80@p...><007601c427da$24cb17e0$9e539696@citkwaclaww2k><6.0.0.22.0.20040421235159.021370c0@p...><00c701c427e6$3adf71a0$9e539696@citkwaclaww2k>

At 23:18 21.4.2004, you wrote:
>Hhmm, I am not sure. From the specs:
>
><quote>
>Validity constraint: Proper Declaration/PE Nesting
>
>Parameter-entity replacement text MUST be properly nested with markup
>declarations. That is to say, if either the first character or the last
>character of a markup declaration (markupdecl above) is contained in
>the replacement text for a parameter-entity reference, both MUST be
>contained in the same replacement text.
></quote>
>
>So, this would be a validation error, and Expat should not report it.
>However, there is also this section:
>
><quote>
>Well-formedness constraint: PE Between Declarations
>
>The replacement text of a parameter entity reference in a DeclSep MUST
>match the production extSubsetDecl.
></quote>
>
>But it seems it doesn't apply here. So maybe Expat is OK?

Yes. Now I think so too (that Expat is right about this). I reported my RXP 
version incorrectly; I have 1.2.5 (old win executable). Not to mention my 
Expat version numbers were reported incorrectly too (1.9.8 duh)  I guess 
this is a bug that's fixed in the
later releases or RXP too. Other parsers seem to catch this. So,
it seems it's not legal to replace DTD declaration tag start i.e. <!ATTLIST
with parameter entity declaration. Why it's possible to use %CLOSE; like
entity in place of closing > is still a mystery...

I was thinking that RXP would be kind of reference implementation for XML 
1.0 and others would be wrong but theold version of RXP (1.2.5) accepted 
something like this too:
<!ENTITY % COND "<![">
%COND;INCLUDE[
<!ENTITY ent "entvalue">
]]>

Others (Xerces-J, MSXML4, Expat 1.95.8) reported this as a syntax error so 
now this matter seems a bit clearer.



with respect,
Toni Uusitalo

• References:
  • DTD parameter entities
    • From: Toni Uusitalo <toni.uusitalo@p...>
  • Re: DTD parameter entities
    • From: "Karl Waclawek" <karl@w...>
  • Re: DTD parameter entities
    • From: Toni Uusitalo <toni.uusitalo@p...>
  • Re: DTD parameter entities
    • From: "Karl Waclawek" <karl@w...>

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