[Latex] tikz draw picture

\usepackage{tikz}

\begin{tikzpicture}[scale=2.5]

\tikzstyle{every node}=[draw,shape=rectangle];

\path (0:0cm) node (Template) {a.Template};

\path (0:1cm) node (www) {b.www};

\path (0:2cm) node (resource) {c.resource};

\draw [->] (Template) to (www);

\draw [->] (www) to (resource);

\end{tikzpicture}