towers.tex

% requires the booktabs package
\newcommand\semtower[2]{% a 2-level semantic tower
  \begin{tabular}[c]{@{\,}c@{\,}}
    \(#1\)
    \\
    \midrule
    \(#2\)
    \\
  \end{tabular}
}
\newcommand\tower[3]{% a 2-level type/category tower
  \begin{tabular}[c]{@{\,}c@{\,}}
    \(\hfil #1\ \vrule width .05em\ #2 \hfil\)
    \\
    \midrule
    \(#3\)
    \\
  \end{tabular}
}