\DeclareDocumentMetadata{
  uncompress,
  pdfversion = 2.0,
  testphase = phase-I,
}
\input{regression-test}
\documentclass{article}
\usepackage[l3build]{luamml-demo}

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

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