added my TikZ examples

tikz/url-structure/url-structure.tex

@@ -0,0 +1,43 @@
+\documentclass{article}
+\usepackage[pdftex,active,tightpage]{preview}
+\setlength\PreviewBorder{2mm}
+\usepackage{tikz}
+\usetikzlibrary{shapes,snakes} 
+\usepackage{amsmath,amssymb}
+
+\begin{document}
+\begin{preview}
+
+
+% Define box and box title style
+\tikzstyle{mybox} = [
+    draw=red, 
+    fill=blue!20, 
+    very thick,
+    rectangle, 
+    rounded corners, 
+    inner sep=10pt, 
+    inner ysep=20pt
+]
+\tikzstyle{fancytitle} =[fill=red, text=white]
+
+
+\begin{tikzpicture}
+\node [mybox] (box){
+    \begin{minipage}{0.9\textwidth}
+        $\underbrace{\text{http}}_{\text{protocol}}
+          \text{://}
+          \underbrace{
+                \overbrace{\text{martin-thoma}}^\text{2\textsuperscript{nd} level domain}
+                \text{.}
+                \overbrace{\text{com}}^\text{TLD}
+          }_\text{hostname}
+          \underbrace{\text{/why-to-study-math/}}_\text{path}
+          \text{\#}
+          \underbrace{\text{Math\_is\_fun}}_\text{Fragment identifier}$
+    \end{minipage}
+};
+\node[fancytitle, right=10pt] at (box.north west) {The URL};
+\end{tikzpicture}
+\end{preview}
+\end{document}