Re: [dev] Adding mathml in a document

Hi Vivien,

If you need a starting document for testing with an already working MathML
example, I suggest to take a look at the ODF specification for Formula:
https://docs.oasis-open.org/office/OpenDocument/v1.3/os/part4-formula/OpenDocument-v1.3-os-part4-formula.odt

I took randomly a piece of MathML from the content, e.g. below from the
content.xml

        <text:p text:style-name="P2">*TBILLEQ is calculated as*</text:p>
        <text:p text:style-name="Formula">
            <draw:frame draw:style-name="fr2" draw:name="Object82"
text:anchor-type="as-char" svg:width="5.369cm" svg:height="1.016cm"
draw:z-index="122">
                *<draw:object xlink:href="./Object 231"*
xlink:type="simple" xlink:show="embed" xlink:actuate="onLoad"/>
                <draw:image xlink:href="./ObjectReplacements/Object 231"
xlink:type="simple" xlink:show="embed" xlink:actuate="onLoad"/>
            </draw:frame>
        </text:p>

Viewed in LibreOffice as:
[image: image.png]

In the subdirectory .*/Object 231* within the ODT you will find:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE math:math PUBLIC "-//OpenOffice.org//DTD Modified W3C MathML
1.01//EN" "math.dtd">
<math:math xmlns:math="http://www.w3.org/1998/Math/MathML";>
 <math:semantics>
  <math:mrow>
   <math:mi math:fontstyle="italic">TBILLEQ</math:mi>
   <math:mo math:stretchy="false">=</math:mo>
   <math:mfrac>
    <math:mrow>
     <math:mn>365</math:mn>
     <math:mo math:stretchy="false">⋅</math:mo>
     <math:mi math:fontstyle="italic">rate</math:mi>
    </math:mrow>
    <math:mrow>
     <math:mn>360</math:mn>
     <math:mo math:stretchy="false">−</math:mo>
     <math:mrow>
      <math:mo math:stretchy="false">(</math:mo>
      <math:mrow>
       <math:mi math:fontstyle="italic">rate</math:mi>
       <math:mo math:stretchy="false">⋅</math:mo>
       <math:mi math:fontstyle="italic">DSM</math:mi>
      </math:mrow>
      <math:mo math:stretchy="false">)</math:mo>
     </math:mrow>
    </math:mrow>
   </math:mfrac>
  </math:mrow>
  <math:annotation math:encoding="StarMath 5.0">TBILLEQ = {365 cdot rate}
over {360 - (rate cdot DSM)}</math:annotation>
 </math:semantics>
</math:math>

I am afraid I do not have the time to experiment myself, but you might want
to strip down the large file into a smaller ODT, containing only one mathml
as example.
You might also want to test if the mathml from the external file is really
working within the draw:object with your ODF application.
At least <math:math> should be a valid child XML:
see
https://tdf.github.io/odftoolkit/odf1.3/OpenDocument-v1.3-reference.html#element_math:math_1
or more formal in the RelaxNG:
https://docs.oasis-open.org/office/OpenDocument/v1.3/os/schemas/OpenDocument-v1.3-schema-rng.html#5458

I am curious about your progress, please report to the list!

Good luck!
Svante

PS: Once you created your MathML in the ODF file, there is a nice HTML
transformation we are using in the ODF TC to generate our HTML documentation
<https://docs.oasis-open.org/office/OpenDocument/v1.3/os/part4-formula/OpenDocument-v1.3-os-part4-formula.html#__RefHeading__1018324_715980110>
.
See
https://github.com/oasis-tcs/odf-tc/?tab=readme-ov-file#odf2html-transformation-not-yet-automated-regression-tests





On Fri, 19 Jan 2024 at 21:09, Michael Stahl <mst@libreoffice.org> wrote:

> hi Vivien,
>
> On 17/01/2024 18:26, vivien guillet wrote:
> > Hello
> >
> > I cannot find the correct way to add mathml to an odt document using
> > odftoolkit.
> >
> > I create a TextPElement / DrawFrameElement / DrawObjectElement container
> > with the MathML element in it this way:
> >
> > TextPElement p = odt.getContentRoot().newTextPElement();
> > DrawFrameElement drawFrame = p.newDrawFrameElement();
> > DrawObjectElement drawObject= drawFrame.newDrawObjectElement();
> > MathMathElement math = drawObjectElement.newMathMathElement();
> >
> > Then the actual mathml nodes in the object
> >
> > OdfElement semantics = odt.getContentDom().createElement("semantics");
> > math.appendChild(semantics);
> >
> > and so on using standard dom operations...
> >
> > When I open the resulting odt, the object is empty.
> >
> > Now if I hand-edit the odt zip content.xml file to add an
> > xmlns="http://www.w3.org/1998/Math/MathML"; attribute to the <math:math>
> > tag, everything displays just fine.
> >
> > creating the math element using
> > OdfElement math =
> > odt.getContentDom().createElementNS("http://www.w3.org/1998/Math/MathML
> ","math:math");
> > yields the same (non working) result
> >
> > working and non-working documents are in attachements.
>
> unfortunately the mailing list doesn't appear to allow attachments...
>
> perhaps try to copy the "draw:object" elment out of the non-working
> content.xml and send that inline, then we can have a look?
>
> > So my question is : what would be the correct way to add mathml inside a
> > document (with the correct mathml namespace attribute) ?
>
> not only the math node must be in the math namespace but all of the
> descendants like "semantics" too - i think that's the most likely
> explanation: create every element with the namespace.
>
> > Any help would be appreciated !
> >
> > V.
>
>
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