These functions are represented as LaTeX, because that's the gold standard for rendering math. But, they also want them available as XML so they're in a more sensible format for archiving.
So, funnily, as part of this, NIST maintain a LaTeX to XML converter.[0] It's a pretty complete LaTeX runtime. (Yes, runtime -- TeX is a programming language, not a markup language!)
This is the thing that powers arXiv Vanity[1] and other academic publishing projects.
I just find it quite amusing that the US Government maintains a LaTeX runtime written in Perl.
So, funnily, as part of this, NIST maintain a LaTeX to XML converter.[0] It's a pretty complete LaTeX runtime. (Yes, runtime -- TeX is a programming language, not a markup language!)
This is the thing that powers arXiv Vanity[1] and other academic publishing projects.
I just find it quite amusing that the US Government maintains a LaTeX runtime written in Perl.
[0] https://dlmf.nist.gov/LaTeXML/
[1] https://www.arxiv-vanity.com/