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List:       lyx-devel
Subject:    Re: DocBook Export - must distinguish between "equation" and "inlineequation"
From:       "Chris Karakas" <chris () karakas-online ! de>
Date:       2004-06-25 23:27:22
Message-ID: 34397692 () web ! de
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Jose' Matos wrote:
> On Wednesday 19 May 2004 02:30, Chris Karakas wrote:
> 

Hello Jose',

> 
> regarding the CDATA or not CDATA inside equations if I try to insert an 
> inequality inside the equation the docbook output is:
> ...
> < alt >\[
> E< mc^{2} \]
> 
> </ alt >
> ...
> without the CDATA jade complains:
> 
> jade:f1.sgml:33:4:E: character "^" not allowed in attribute specification 
> list
> jade:f1.sgml:33:4:E: element "MC" undefined
> jade:f1.sgml:36:11:E: end tag for "EQUATION" which is not finished
> 
> don't you get this?
> 
> 

Indeed, I get this. I had never tried an inequality, so I was caught by surprise!

However, it turned out that the solution is simple: you should write the SGML \
entities of < and > instead of the brackets themselves! I adapted my scripts to do \
this:

First, the sedscr script 

http://www.karakas-online.de/mySGML/sedscr

inserts a newline after the $ that follows an < alt > tag. Then, the awkscr_math \
script 

http://www.karakas-online.de/mySGML/awkscr_math

transforms < and > inside alt tags (but excluding the lines where the tags themslves \
happen to be - the line of the starting alt tag containing only the alt tag itself \
due sedscr's inserted newline) to their SGML entities.

See

http://www.karakas-online.de/mySGML/explain-sgml-math-code-correction.html

I have added some inequalities for you in 

http://www.karakas-online.de/mySGML/lyx-writing-mathematics.html

> -D

to see that it works.

If you look at the equation-list.sgml file:

http://www.karakas-online.de/mySGML/equation-list.sgml

you will see that the inequalities inside the alt tags now contain the *numeric* \
entities:

> < texequation
fileref="images/math/19259.png"
> \[
a & # 60 ; b & # 62 ; c,\]
  < /texequation

How come? Well, this is done by the unescape() function of the texmath2pngbmp.pl \
script:

http://www.karakas-online.de/mySGML/texmath2pngbmp.pl

sub unescape {
    $eqn =~ s/ & # 38 ; / & /g;
    $eqn =~ s/ & # 62 ; /\ >/g;
    $eqn =~ s/& # 60 ; /\< /g > 

<  and > are represented by their respective SGML entities inside the alt tags. 

Thus, the only thing you have to do is replace < and > with their entities instead of \
including  the alt part in CDATA!

Chris

-- 
Regards

Chris Karakas
http://www.karakas-online.de


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