documentclass[tikz]{standalone}

begin{document}

begin{tikzpicture}
draw (0,0) rectangle (2,3);
end{tikzpicture}

end{document}

usemodule[tikz]
startTEXpage
  starttikzpicture
    draw (0,0) rectangle (2,3);
  stoptikzpicture
stopTEXpage