fix: Allow MathML elements with m:math namespace in JATS

[rgieseke]

As can be seen in #876 tools like Pandoc or LaTeXML produce MathML nodes with different namespaces.

LaTeXML's m:math is currently not read by encoda.

A simple fix is to also look for this namespace in the JATS decoder. I looked into doing the right thing and trying to read the namespace but this is probably a good enough solution if you want to include this.

According to the JATS tag browser m is common even though mml seems to be the official standard.

MathML Namespacing: The vast majority of users of this Tag Set use the DTDs as their primary (or only) model, so this Tag Set is maintained to ensure that users of DTDs and DTD-based tools will work well. Because DTDs do not “play well” with namespaces, and most DTD-based tools are not namespace aware, the MathML namespace has been hardcoded to the prefix “mml” in the DTDs. This means that the element name, in the DTDs, really is mml:math. While this was the usual prefix when this Tag Set was originally established, the more frequently seen prefix is now “m”. Since XSD and RNG use “real” namespaces, this makes no difference to them, as to a namespace-aware processor a namespace prefix is only a placeholder. For DTD users, the element names in the MathML will need to be “mml” (for example, mml:mfrac), but tools can be set to provide that prefix and the essence of namespaces is that prefixes do not matter, so no harm is done.

https://jats.nlm.nih.gov/publishing/tag-library/1.2/element/mml-math.html

Happy to look into providing test cases or consider alternatives!

[nokome]

Thanks for this @rgieseke, great to be getting your feedback and contributions!

I am happy to merge without a test given this is small but could you please fix the linting error:

https://dev.azure.com/stencila/stencila/_build/results?buildId=10972&view=logs&j=ad07b744-5a1a-5d54-7693-fcb02e666633&t=94df1b64-f1bb-5c49-0094-5b7458b33f31&l=20

by changing || to ??.

[rgieseke]

Sure, and will try to run npm run lint before pushing next time!

[stencila-ci]

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