\documentclass[tikz]{standalone}
\usepackage{tikz}

% Semantic Web Layer Cake: https://www.w3.org/2007/03/layerCake.svg
% TikZ interpretation by Natanael Arndt <arndtn@gmail.com>
% If you like: CC-by
% If you don't want to place a name: CC-0

\begin{document}

\tikzstyle{label}=[align=center]
\tikzstyle{layer}=[draw, label, anchor=south west, minimum height=.75cm, minimum width=1cm]

\begin{tikzpicture}[]
  %\draw[help lines,step=.25,color=gray!20] (0,0) grid (9,8.75);

  % Representation
  \draw (0,0) node    (iri)     [layer, minimum width=7.75cm]           {URI/IRI\strut};
  \draw (4,1) node    (xml)     [layer, minimum width=3.75cm]           {XML\strut};
  \draw (0,1) -- ++(0,1.75) -- ++(7.75,0) -- ++(0,-.75) -- ++(-4,0) -- ++(0,-1) -- cycle;
  \node at (2,2)                [anchor=base, text width=3.5cm, label]  {Data interchange:\\RDF\strut};

  % Query & Update
  \draw (.5,3) node   (query)   [layer, minimum width=1.75cm, minimum height=1.75cm, text width=1.5cm] {Query: SPARQL\strut};

  % Reasoning
  \draw (2.5,3) node  (rdfs)    [layer, minimum width=3.25cm]           {RDFS\strut};
  \draw (2.5,4) node  (owl)     [layer, minimum width=3.25cm]           {Ontology: OWL\strut};
  \draw (6,3) node    (rif)     [layer, minimum width=1.75cm, minimum height=1.75cm, text width=1.5cm] {Rule: RIF\strut};
  \draw (1.5,5) node  (logic)   [layer, minimum width=5.25cm]           {Unifying Logic\strut};

  % Trust
  \draw (4,6) -- ++(0,.75) -- ++(3.75,0) -- ++(0,-1.75) -- ++(-.75,0) -- ++(0,1) -- cycle;
  \node at (6,6.25)             [anchor=base, text width=3.5cm, label]  {Proof\strut};
  \draw (8,0) node    (crypto)  [layer, minimum height=6.75cm]          {};
  \node at (8.5,3.5)            [label, rotate=90]                      {Crypto\strut};
  \draw (5.25,7) node (trust)   [layer, minimum width=3.75cm]           {Trust\strut};

  % Interaction
  \draw (0,8) node    (ui)      [layer, minimum width=9cm]              {User Interface \& Applications\strut};
\end{tikzpicture}
\end{document}