DOCTYPE specs

DOCTYPE specs

[Taco Hoekwater]

Begin forwarded message:

Date: Wed, 3 Jul 2002 10:32:05 +0200
From: "Taco Hoekwater" <taco@elvenkind.com>
To: "Simon Pepping" <spepping@scaprea.hobby.nl>
Subject: Re: Problem with expansion of entities in the internal DTD set

DOCTYPE processing has been broken for as long as i can remember ;)
I'm not quite sure how Hans wants to handle the internal subset, but
for reference: an internal doctype looks like this:

1. <!DOCTYPE
2. a word that is the top-level element, like
   article
3. optional: either
   PUBLIC
   or
   SYSTEM

3a. PUBLIC keys are an sgml quoted string (with ' or ") that gives
    the external reference, optionally followed by
    another quoted string that is a filesystem locator
    for the DTD.

3b. SYSTEM keys are an sgml quoted string that is the
    filesystem locator for the DTD

4. Next is an optional internal subset.

5. >

So, assuming Simon's example, the following are all legal
(some only in XML I think):

----
<!DOCTYPE article PUBLIC '-//OASIS//DTD DocBook XML V4.1.2//EN'
          "file:///var/share/sgml/docbook/dtd/xml/4.1.2/docbookx.dtd"
[
 <!ENTITY date       "2002-06-XX">
 <!ENTITY revno      "0.0.2">
]>
----
<!DOCTYPE article PUBLIC '-//OASIS//DTD DocBook XML V4.1.2//EN'
          "file:///var/share/sgml/docbook/dtd/xml/4.1.2/docbookx.dtd"
>
----
<!DOCTYPE article PUBLIC '-//OASIS//DTD DocBook XML V4.1.2//EN'
[
 <!ENTITY date       "2002-06-XX">
 <!ENTITY revno      "0.0.2">
]>
-----
<!DOCTYPE article PUBLIC '-//OASIS//DTD DocBook XML V4.1.2//EN'
>
----
<!DOCTYPE article SYSTEM
          "file:///var/share/sgml/docbook/dtd/xml/4.1.2/docbookx.dtd"
>
----
<!DOCTYPE article SYSTEM 
          "file:///var/share/sgml/docbook/dtd/xml/4.1.2/docbookx.dtd"
[
 <!ENTITY date       "2002-06-XX">
 <!ENTITY revno      "0.0.2">
]>
----
<!DOCTYPE article 
[
 <!ENTITY date       "2002-06-XX">
 <!ENTITY revno      "0.0.2">
]>
----
<!DOCTYPE article 
>
-----

On Mon, 1 Jul 2002 22:40:11 +0200
"Simon Pepping" <spepping@scaprea.hobby.nl> wrote:

> - entity expansion in the internal DTD set does not work correctly:
>   the first entity is not expanded, e.g.:
> 
> <?xml version='1.0' encoding='ISO-8859-1'?>
> <!DOCTYPE article PUBLIC '-//OASIS//DTD DocBook XML V4.1.2//EN'
>           "file:///var/share/sgml/docbook/dtd/xml/4.1.2/docbookx.dtd"
> [
>  <!ENTITY date       "2002-06-XX">
>  <!ENTITY revno      "0.0.2">
> ...
> ]>
> 
>  'date' is not expanded and appears as text surrounded by a box.
> 
> - if there is at least one entity declaration in the prologue (whether
>   this entity is used or not is not important!) leads to an additonal
>   first page which contains ']?' in the upper left corner. The article
>   itself starts at next page like normal.
> 
> Simon
> 
> -- 
> Simon Pepping
> email: spepping@scaprea.hobby.nl

-- 
groeten,

Taco

-- 
groeten,

Taco

Re: DOCTYPE specs

[Simon Pepping]

On Tue, Sep 17, 2002 at 08:57:02AM +0200, Taco Hoekwater wrote:
> 
> 
> Begin forwarded message:
> 
> Date: Wed, 3 Jul 2002 10:32:05 +0200
> From: "Taco Hoekwater" <taco@elvenkind.com>
> To: "Simon Pepping" <spepping@scaprea.hobby.nl>
> Subject: Re: Problem with expansion of entities in the internal DTD set
> 
> 3a. PUBLIC keys are an sgml quoted string (with ' or ") that gives
>     the external reference, optionally followed by
>     another quoted string that is a filesystem locator
>     for the DTD.

In XML the second quoted string is mandatory. Therefore these two
examples are not valid XML:

> <!DOCTYPE article PUBLIC '-//OASIS//DTD DocBook XML V4.1.2//EN'
> [
>  <!ENTITY date       "2002-06-XX">
>  <!ENTITY revno      "0.0.2">
> ]>
> -----
> <!DOCTYPE article PUBLIC '-//OASIS//DTD DocBook XML V4.1.2//EN'
> >

Regards, Simon

-- 
Simon Pepping
email: spepping@scaprea.hobby.nl

Re: DOCTYPE specs

[Michael Wiedmann]

* Simon Pepping <spepping@scaprea.hobby.nl> [020917 20:27]:
...
> In XML the second quoted string is mandatory. Therefore these two
> examples are not valid XML:
>  
> > <!DOCTYPE article PUBLIC '-//OASIS//DTD DocBook XML V4.1.2//EN'
> > [
> >  <!ENTITY date       "2002-06-XX">
> >  <!ENTITY revno      "0.0.2">
> > ]>
> > -----
> > <!DOCTYPE article PUBLIC '-//OASIS//DTD DocBook XML V4.1.2//EN'
> > >

I agree with Simon and because I was the submitter of the above
examples I 'apologize' for any inconvenience these may have caused...

Michael
-- 
mw@miwie.in-berlin.de                              http://www.miwie.org
mw@miwie.org

Re: DOCTYPE specs

[Taco Hoekwater]

The context parser doesnt make a distinction between XML and SGML,
besides this is a silly specification. What precisely is the point
of a required "system URI" if it is allowed to be empty?

On Tue, 17 Sep 2002 20:27:22 +0200, Simon wrote:

> In XML the second quoted string is mandatory. Therefore these two
> examples are not valid XML:

-- 
groeten,

Taco