Re: [libreoffice-users] math issues

Hi Marc,

Marc Grober schrieb:
> > It is exact as described in the link: First Insert>  Object>  Formula.
> > Now you are in the formula editor. And then Tools>  Import Formula.
>
> Only if yo don't exit the equation editor before selecting
> Tools->Import, which one might do in as much as the documentation does
> not include those few precious words "while the equation editor is
> open", lol.
>
> Now, as far as importing xml files,  I have never been successful at
> importing mathml and must assume that this is accomplished through some
> secret handshake as well ;-)
> for example, an attempt to import test.xml which consisted of the following:
>
>   <?xml version="1.0" encoding="UTF-8"?>
>    <!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN"
>             "http://www.w3.org/Math/DTD/mathml2/mathml2.dtd";>
>    <math xmlns="http://www.w3.org/1998/Math/MathML";>
>      <mrow>
>        <mi>a</mi>
>        <mo>&#x2062;<!--&InvisibleTimes; --></mo>
>        <msup>
>          <mi>x</mi>
>          <mn>2</mn>
>        </msup>
>        <mo>+</mo>
>        <mi>b</mi>
>        <mo>&#x2062;<!--&InvisibleTimes; --></mo>
>        <mi>x</mi>
>        <mo>+</mo>
>        <mi>c</mi>
>      </mrow>
>    </math>
>
> was unsuccessful.

I had tested that very same example before I had answered. Besides the 
fact, that the character &#x2062; is rendered wrong, the import is 
without problems.

So there must be some difference between my and your way. So next try 
with a step by step description:

Precondition: The MathML is saved as file on disk, for example "mymath.xml".

1. Open a Writer document or use a new one. Set the cursor where the 
formula should be.

2. Insert > Object > Formula. Now the equation editor is open. The top 
menu has changed, a part of the writer document is shown, with a 
rectangle where the formula will be, and a command window with a 
blinking cursor exists.

4. Tools > Import Formula. You get a file picker. Choose your 
MathMl-file, here mymath.xml. Click on button 'Insert'.

5. Now you have the proper command in the command window. If something 
is wrong (for example the character &#x2062; mentioned above), you can 
correct it.

6. Klick outside the formula into your Writer document. Finished.

> An attempt to export similar code as writer xml was similarly
> ineffective on import.

If you only want to convert a single formula to MathML and your formula 
is inside a Writer document, then right-click the formula. The context 
menu opens and the last item is "Save as...". Use this and select 
"MathML" from the list of available file formats. You will get a single 
MathML file. It does not matter whether you use the file extension .mml 
or .xml.
Reimporting this file as described above, gives the same formula as 
exported, because the original LO formula is written to an annotation 
element and read when imported.
You should use grouping brackets to generate a well structured formula 
in LO, although LO does not need them to render the formula. It will 
give better results in export.

If you want to export the whole Writer document with an easy access to 
the MathML without unzipping, you can use File > Export > type XHTML, or 
File > Save as > type "Flat XML".

Do you understand German? Than the German "Handbuch für Math" on 
http://de.libreoffice.org/hilfe-kontakt/handbuecher/ might give you some 
ideas.

Kind regards
Regina



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