\RequirePackage{pdfmanagement-testphase}
\DeclareDocumentMetadata{
  uncompress,
  pdfversion = 2.0,
}
\documentclass{article}
\usepackage[l3build]{luamml-demo}
\usepackage{tagpdf}
\tagpdfsetup{
  activate-all,
  interwordspace=true,
}

\usepackage{unicode-math}

\begin{document}
\tagstructbegin{tag=Document}
\LuaMMLTagAF{} {
\[
  \begin{pmatrix}
    1 & 0 & 0 \\
    0 & 1 & 0 \\
    0 & 0 & 1
  \end{pmatrix}
  =
  \begin{cases}
    1 & $if $a=b\\
    2 & $else$
  \end{cases}
\]
}
\LuaMMLTagAF{} {
\[
  x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}.
\]
}
\LuaMMLTagAF{} {
\[
  \sum_a\underline c\dot bc'
\]
}

\LuaMMLTagAF{} {
\begin{align}
  abc&=def & e^{\mathrm{i}\pi}&=-1\\
  \Big(1+2&=3\Big)\\
  5
\end{align}
}

Es gilt \LuaMMLTagAF{}{$\sin(x)-\sin(x+2\pi)=0$}.
\tagstructend
\end{document}