How to deal with schemes of curly braces [duplicate]

Question

I'm looking for a package if it exists or options to deal with schemes that use curly braces. In general, how can I do something like this:

Answer 1

The schemata package is designed to handle simple and complex schemas of just this kind. If you are not using mathematical content, one advantage of this approach is that it is primarily designed for typesetting textual schemas. (Though no doubt you could use it with mathematical content if you wished.)

For example:

\documentclass{article}
\usepackage{schemata}
\begin{document}
\schema{%
  \schemabox{Main}%
}{%
  \schema{%
    \schemabox{Option A}%
  }{%
    \schemabox{%
      Option AA\\
      Option AB%
    }%
  }%
  \schema{%
    \schemabox{Option B}%
  }{%
    \schemabox{%
      Option BA\\
      Option BB%
    }%
  }%
}
\end{document}

EDIT

If your schema is quite simple, you could alternatively draw it as a tree:

\documentclass[tikz,border=10pt]{standalone}
\usepackage{forest}
\usetikzlibrary{decorations.pathreplacing}
\forestset{
  forest scheme/.style={
    for tree={
      grow'=0,
      anchor=west,
      align=left,
      if n=1{%
        edge path={
          \noexpand\path [\forestoption{edge}] (!ul.south west) -- (!u1.north west)\forestoption{edge label};
        }
      }{no edge},
      edge={decorate, decoration={brace}},
    },
  }
}
\begin{document}
\begin{forest}
  forest scheme
  [Main
    [Option A
      [Option AA]
      [Option AB]
    ]
    [Option B
      [Option BA]
      [Option BB]
    ]
  ]
\end{forest}
\end{document}

But this solution is not as robust or flexible as use of the specialist package.

Answer 2

An alternate process might be to use the amsmath cases environment.

\documentclass[12pt]{article}

\usepackage{amsmath}

\begin{document}

$\text{main} 
\begin{cases}
\text{Case a} \begin{cases} \text{case 1} \\ \text{case 2} \end{cases} \\
\text{Case B} \begin{cases} \text{case 1} \\ \text{case 2} \end{cases}
\end{cases}$

\end{document}

which yields the example:

Answer 3

The following might be a start for you:

\documentclass{article}
\usepackage{array}

\begin{document}

\begin{center}
  \begin{tabular}{ m{5em} @{} m{11em} }
    Main $\left\{\rule{0pt}{\dimexpr2\normalbaselineskip+.5\bigskipamount}\right.$ &
        \begin{tabular}{@{}l@{}}
          $\mbox{Option A }\left\{\begin{tabular}{@{~}l@{}}
            Option AA \\[\bigskipamount]
            Option AB
          \end{tabular}\right.$\hspace{-\nulldelimiterspace} \\[\bigskipamount]
          $\mbox{Option B }\left\{\begin{tabular}{@{~}l@{}}
            Option BA \\[\bigskipamount]
            Option BB
          \end{tabular}\right.$\hspace{-\nulldelimiterspace}
        \end{tabular}
  \end{tabular}
\end{center}

\end{document}

I've added some spaces as part of the column separation, but they might not be needed, depending on your application. Similarly, the \nulldelimiterspace corrections might not be needed.

One main assumption in the above code is the use of non-paragraph text as the "Option" text.