Bug#551740: dblatex fails on some documents with MathML equations

[Petr Břeň]

Package: dblatex
Version: 0.2.12-1

When I attempt to transform a XML DocBook document with MathML
equations to PDF using dblatex, an error occurs in some cases. It
works on most occasions, but there is a problem with equations that
have a new line inside. An example file is attached. It is valid
because it transforms well with xsltproc. But dblatex produces the
following error:

Build the book set list...
Build the listings...
XSLT stylesheets DocBook - LaTeX 2e (0.2.12-1)
===================================================
Build test.pdf
pdflatex failed
test.tex:59: Package array Error: Empty preamble: `l' used.
test.tex:59: leading text: $ \begin{array}{}
test.tex:59: Missing $ inserted.
test.tex:59: leading text: $ \begin{array}{}\frac{{d}^{2}x}{d{z}^{2}}
test.tex:59: Missing $ inserted.

(snip.. the lines repeate several times)

test.tex:59: Missing } inserted.
test.tex:59: leading text: ...c{{d}^{2}x}{d{z}^{2}}-{\beta }^{2}x=0\\ \\

A possible reason for transformation failure is invalid DocBook
(as reported by xmllint)



I am using Debian unstable/experimental, updated practically on a
daily basis, kernel 2.6.30-1-amd64, libc6 2.10.1-0exp2.

<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" "http://docbook.org/xml/4.2/docbookx.dtd";>
 <article lang="cs">
 <para><math:math xmlns:math="http://www.w3.org/1998/Math/MathML";>
 <math:semantics>
  <math:mtable>
   <math:mtr>
    <math:mrow>
     <math:mfrac>
      <math:mrow>
       <math:msup>
        <math:mi>d</math:mi>
        <math:mn>2</math:mn>
       </math:msup>
       <math:mi>x</math:mi>
      </math:mrow>
      <math:mrow>
       <math:mi>d</math:mi>
       <math:msup>
        <math:mi>z</math:mi>
        <math:mn>2</math:mn>
       </math:msup>
      </math:mrow>
     </math:mfrac>
     <math:mrow>
      <math:mi/>
      <math:mo math:stretchy="false">−</math:mo>
      <math:mi/>
     </math:mrow>
     <math:msup>
      <math:mo math:stretchy="false">β</math:mo>
      <math:mn>2</math:mn>
     </math:msup>
     <math:mi>x</math:mi>
     <math:mrow>
      <math:mi/>
      <math:mo math:stretchy="false">=</math:mo>
      <math:mi/>
     </math:mrow>
     <math:mn>0</math:mn>
    </math:mrow>
   </math:mtr>
   <math:mtr/>
   <math:mtr>
    <math:mrow>
     <math:mfrac>
      <math:mrow>
       <math:msup>
        <math:mi>d</math:mi>
        <math:mn>2</math:mn>
       </math:msup>
       <math:mi>y</math:mi>
      </math:mrow>
      <math:mrow>
       <math:mi>d</math:mi>
       <math:msup>
        <math:mi>z</math:mi>
        <math:mn>2</math:mn>
       </math:msup>
      </math:mrow>
     </math:mfrac>
     <math:mrow>
      <math:mi/>
      <math:mo math:stretchy="false">+</math:mo>
      <math:mi/>
     </math:mrow>
     <math:msup>
      <math:mo math:stretchy="false">β</math:mo>
      <math:mn>2</math:mn>
     </math:msup>
     <math:mi>y</math:mi>
     <math:mrow>
      <math:mi/>
      <math:mo math:stretchy="false">=</math:mo>
      <math:mi/>
     </math:mrow>
     <math:mn>0</math:mn>
    </math:mrow>
   </math:mtr>
  </math:mtable>
  <math:annotation math:encoding="StarMath 5.0">{&nbsp;d rsup{2} x } over {d z&nbsp;rsup{2} } `- `%beta rsup{2} x `=` 0 newline newline
{ d rsup{2} y } over {d z&nbsp;rsup{2} } `+ `%beta rsup{2} y `=` 0</math:annotation>
 </math:semantics>
</math:math></para>
 </article>