\documentclass[12pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}
\begin{document}
\begin{tikzpicture}
\node[align=left] (top_node) at (0,0) {<<title>> \\ Key: <<keystem>> $\vert$ <<keyleaf>> = <<keyvalue>>};
\node[below=of top_node,yshift=10mm] {
\begin{tabular}{r|c|l}
\textbf{<<leaf1_title>>} & \textbf{Stem} & \textbf{<<leaf2_title>>}\\
\hline
<<data>>
\end{tabular}};
\end{tikzpicture}
\end{document}