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From: Hans Hagen <pragma@wxs.nl>
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Subject: Re: Some XML typesetting questions
Date: Mon, 08 Oct 2001 11:25:50 +0200
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Cc: Jaroslav Snajdr <jarda@tinysoftware.cz>, ntg-context@ntg.nl
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At 09:10 AM 10/8/2001 +0200, Berend de Boer wrote:
>Jaroslav Snajdr <jarda@tinysoftware.cz> writes:
>
> > Hello,
> >
> > I've started playing with XML support in Context and have a couple of 
> problems:
> >
> > 1. My XML document is divided into several files. The DOCTYPE 
> declaration looks like this:
> >
> > <!DOCTYPE book PUBLIC ...docbook stuff... [
> >   <!ENTITY ch1 SYSTEM "chapter1.xml">
> >   <!ENTITY ch2 SYSTEM "chapter2.xml">
> > ]>
> > <book>
> > ..
> > &ch1;
> > &ch2;
> > ..
> > </book>
> >
> > How can I process this document in Context? I can define the
> > entities &chx;, but that means to define the mapping to file at two
> > places.
>
>
>I think Hans should give you a call back for ENTITY. There you can do
>your own parsing and define the entities based on the particular
>entity definition.
>
>AFAIK this is not yet possible.

You're right! Say that you have:

\unprotect

\def\@@XMLescape {\@@XML esc}

\def\defineXMLescape[#1]#2{\long\setvalue{\@@XMLescape:#1}{#2}}

\defineXMLescape [--]         {\gobbleuntil{-->}}
\defineXMLescape [CDATA]      {\skipfirstverbatimlinefalse
                                \processtaggeddisplayverbatim{]]>}}
\defineXMLescape [\s!default] {\gobbleuntil{>}}

\def\executeXMLescape#1%
   {\executeifdefined{\@@XMLescape:#1}{\getvalue{\@@XMLescape:\s!default}}}

\protect

\long\def\xdoXMLelement !#1 % !-- --> or !xyz >
   {\endgroup\executeXMLescape{#1}}

Now, given that you have a </hello/> <world/> file, and a ! handler like:

\defineXMLescape [DOCTYPE] {\handleXMLescapeDOCTYPE}
\defineXMLescape [ENTITY]  {\handleXMLescapeENTITY}

\def\handleXMLescapeDOCTYPE#1[#2]>%
   {#2}

\def\handleXMLescapeENTITY#1 #2 "#3"#4>%
   {\doif{#2}{SYSTEM}{\defineXMLentity[#1]{\readfile{#3}{}{}}}}

then:

\defineXMLsingular [test] {WHOW}
\defineXMLsingular [hello] {Hello}
\defineXMLsingular [world] {World}

\startXMLdata
<!DOCTYPE some unreadable crap
   [ <!ENTITY wellwell SYSTEM "test.xml"> ]>
test <test/>
<!-- hellup -->
test <test/>
&wellwell;
\stopXMLdata

will do what you want. But i suppose that the DOCTYPE syntax is richer that 
this example and i praise myself lucky that i don;t have a copy of the 
specs here -)

Hans
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                                   Hans Hagen | PRAGMA ADE | pragma@wxs.nl
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