[dev-context] xtag-mmp.tex patch

[Duncan Hothersall]

At line 492 in xtag-mmp.tex:

\def\pMULTISCRIPTmmlPRE#1#2#3#4%
  {\ifdone
     \ifodd\scratchcounter
       ^{\naturalxmlr{#1}{#2}{#3}{#4}}{}%
     \else
       _{\naturalxmlr{#1}{#2}{#3}{#4}}%
     \fi
   \else
     \doif{mprescripts/}{#1}{\donetrue{}}% weak, the / here
   \fi
   \ifdone \advance\scratchcounter 1 \fi}

I think the super/sub scripts are the wrong way around; suggest swapping
fourth and sixth lines:

\def\pMULTISCRIPTmmlPRE#1#2#3#4%
  {\ifdone
     \ifodd\scratchcounter
       _{\naturalxmlr{#1}{#2}{#3}{#4}}%
     \else
       ^{\naturalxmlr{#1}{#2}{#3}{#4}}{}%
     \fi
   \else
     \doif{mprescripts/}{#1}{\donetrue{}}% weak, the / here
   \fi
   \ifdone \advance\scratchcounter 1 \fi}

According to the MathML spec
http://www.w3.org/TR/2003/REC-MathML2-20031021/chapter3.html#presm.mmultiscripts
the syntax is
<mmultiscripts>
    base
     (subscript superscript)*
     [ <mprescripts/> (presubscript presuperscript)* ]
</mmultiscripts>

Thanks from the strange world of presentational MathML,

Duncan