MathML: How to insert line breaks?

[Frank Ralf]

Hi,

I've tried both recommended methods to insert a line break in MathML but this is neither rendered in oXygen 16.1 nor in the PDF output when including the MathML in a DITA document.

Code: Select all

<mspace linebreak='newline' />



<mo linebreak='newline' linebreakstyle='after'>+</mo>

Am I missing something?

Best regards,
Frank

[Radu]

Hi Frank,

Line breaks seem to be a feature added in MathML 3.0 and the Apache JEuclid library used by default by Oxygen to render MathML equations in the Author mode and when producing the PDF does not have support for MathML 3.0:

http://jeuclid.sourceforge.net/faq.html

Oxygen also has support for installing a commercial MathFlow editor to be used for editing and rendering in the Author editing mode:
https://www.oxygenxml.com/doc/versions/ ... odes2.html

and possibly Mathflow could also be used somehow to convert the Mathml equation to an SVG in order to include it in a PDF. But I do not know if Mathflow supports this type of line breaks in equations, they would need to be contacted and asked further.

Regards,
Radu

[Frank Ralf]

Hi Radu,

Many thanks for your quick reply. Actually, <mspace linebreak='newline' /> should also work with MathML 2.0. However, most rendering engines don't seem to support line breaking (yet), for example Firefox. But according to http://jeuclid.sourceforge.net/jeuclid- ... break3.xml, jeuclid renders line breaks correctly.

MathFlow provides some useful information about MathML 3 Linebreaking and Indentation Examples.

Kind regards,
Frank

[Frank Ralf]

Regarding JEuclid, the strange thing is that line breaks do render in the MathML 2.0 test suite but not in the MathML 3.0 test suite.

[Radu]

Hi Frank,

JEuclid also distributes a MathViewer based on its own libraries. Here's the Windows version for it:

https://sourceforge.net/projects/jeucli ... p/download

and neither of the samples from their test suite seems to generate a line break when using it.

Regards,
Radu

[Frank Ralf]

Hi Radu,

Many thanks for this pointer and testing.

Best regards,
Frank

[chrispitude]

Hmmm, I need a solution to this too! We have multi-line equations in our books that are not breaking in the PDF Chemistry output using any of the methods I've tried.

[chrispitude]

Some additional data - the LibreOffice Math open-source equation editor does not understand the <mspace linebreak='newline' /> element, but the MathFlow commercial equation editor does (including creating multi-line equations).

[julien_lacour]

Hello,

I have logged an issue in our tracking system, I will let you know as soon as a fix will be available.
At the moment, the only solution is to split the equation in multiple blocks using <equation-block> elements.

Regards,
Julien

[chrispitude]

MathJax 2.x renders the linebreak but MathJax 3.x does not. I added a comment here:

https://github.com/mathjax/MathJax/issues/2495

[chrispitude]

MathJax 2.x renders the linebreak but MathJax 3.x does not. I added a comment here:

https://github.com/mathjax/MathJax/issues/2495

Here's the reply to my comment in the MathJax issue discussion:

It is scheduled for second-quarter next year.

[julien_lacour]

Hello Chris,

At the moment Oxygen PDF Chemistry does not include MathJax library.
I will let you know if in the future, we integrate MathJax as MathML rendering tool.

Regards,
Julien