Issue with MathML

by **Milqn** » Thu Aug 11, 2022 7:41 pm

Hi,
Nice work you have done with Docx4j!

I need to convert html with MathML to docx but during conversion MathML tags are striped.

How could I make this work?
Hope you can help me.

Thanks
Milqn

by **jason** » Fri Aug 12, 2022 7:50 pm

There is XSLT for converting OMML to MathML, but maybe not for the converse.

Google reveals python and npm libraries called mathml2omml (and there may be others); if one of these work well enough on your MathML, you could integrate them into docx4j-ImportXHTML.

by **Milqn** » Fri Aug 12, 2022 10:06 pm

Thank you for your answer!

I also thought that my issue could arise due to the Ooml.

MathML tags are not preserved and hence, LibreOffice also can't display math.

by **Milqn** » Tue Aug 16, 2022 7:37 am

Please don't mind but I need to ask what would be the best way to include MML2OMML?
I have find MML2OMML.XSL stylesheet.

How would you do it?

Thanks a lot

by **Milqn** » Fri Aug 19, 2022 4:41 am

Any assistance would be gratefully appreciated.

jason wrote:There is XSLT for converting OMML to MathML, but maybe not for the converse.

Google reveals python and npm libraries called mathml2omml (and there may be others); if one of these work well enough on your MathML, you could integrate them into docx4j-ImportXHTML.

by **jason** » Tue Aug 23, 2022 9:57 pm

Here's a sketch of how to do it to help you get started, mostly untested, but based on importing the following sample XHTML:

Code: Select all: <?xml version="1.0" encoding="UTF-8"?> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>MathML in XHTML</title> </head> <body> <p> Follows: <math xmlns="http://www.w3.org/1998/Math/MathML"> <mfrac> <mn>1</mn> <msqrt> <mn>2</mn> </msqrt> </mfrac> </math> </p> </body> </html>

In XHTMLImporterImpl, at approx line 1383, add and flesh out the following block of code:

Syntax: [ Download ] [ Hide ]

Using java Syntax Highlighting

}elseif(e.getNodeName().equals("math")){

// handle me
System.out.println("TODO: Handle mathml \n\r"+ XmlUtils.w3CDomNodeToString(e));

// Prepare to transform Element e

                        Templates xslt =null;// your mathml2omml.xslt 

// Use constructor which takes Unmarshaller, rather than JAXBContext,
// so we can set JaxbValidationEventHandler

                        JAXBContext jc =Context.jc;

                        Unmarshaller u;
try{

                                        u = jc.createUnmarshaller();

                                u.setEventHandler(new org.docx4j.jaxb.JaxbValidationEventHandler());

                                jakarta.xml.bind.util.JAXBResult result =new jakarta.xml.bind.util.JAXBResult(u );

                                XmlUtils.transform(new DOMSource(e), xslt, null, result);

// What happened?
Object o = result.getResult();

// Attach it to the document
this.contentContextStack.peek().getContent().add();// or addAll

}catch(JAXBException e1){

                                        e1.printStackTrace();
}

return;

Parsed in 0.016 seconds,  using GeSHi 1.0.8.4

by **jason** » Wed Aug 24, 2022 10:41 pm

The following proof of concept code works on my sample XHTML:

Syntax: [ Download ] [ Hide ]

Using java Syntax Highlighting

}elseif(e.getNodeName().equals("math")){

// handle me
System.out.println("Handling mathml \n\r"+ XmlUtils.w3CDomNodeToString(e));

try{
// Prepare to transform Element e

                                Source xsltSource  =new StreamSource(

                                                ResourceUtils.getResource(
"mml2omml.xsl")
);// https://raw.githubusercontent.com/Marti ... l2omml.xsl
/* You need to add the template:

                                 * 

                                                  <xsl:template match="/|*">

                                                    <oMath>

                                                      <xsl:apply-templates mode="mml"  />

                                                    </oMath>

                                                  </xsl:template>

                                 */

                                Templates xslt  = XmlUtils.getTransformerTemplate(xsltSource);

// Use constructor which takes Unmarshaller, rather than JAXBContext,
// so we can set JaxbValidationEventHandler

                                JAXBContext jc =Context.jc;

                                Unmarshaller u = jc.createUnmarshaller();

                                u.setEventHandler(new org.docx4j.jaxb.JaxbValidationEventHandler());

                                jakarta.xml.bind.util.JAXBResult result =new jakarta.xml.bind.util.JAXBResult(u );

                                XmlUtils.transform(new DOMSource(e), xslt, null, result);

// What happened?

                                org.docx4j.math.CTOMath math =(org.docx4j.math.CTOMath)XmlUtils.unwrap(result.getResult());

                                org.docx4j.math.ObjectFactory mathObjectFactory =new org.docx4j.math.ObjectFactory();
// Create object for oMathPara (wrapped in JAXBElement) 

                        CTOMathPara omathpara = mathObjectFactory.createCTOMathPara();

                        JAXBElement<org.docx4j.math.CTOMathPara> omathparaWrapped = mathObjectFactory.createOMathPara(omathpara);

                        omathpara.getOMath().add(math);

                        P wP =new P();

                        wP.getContent().add(omathparaWrapped);

// Attach it to the document
this.contentContextStack.peek().getContent().add(wP);

}catch(Exception e1){
thrownew Docx4JException("Error processing MathML", e1);
}

return;

Parsed in 0.018 seconds,  using GeSHi 1.0.8.4

Note that the heavy lifting is done by https://raw.githubusercontent.com/Marti ... l2omml.xsl

by **infomladen** » Thu Aug 25, 2022 9:03 am

That's what I'm looking for. Great work.
Thanks a lot, Jason.

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