\begin{frame} \frametitle{Relationship Sets and Role Names} \begin{goal}{} The relationship set connections can be annotated with \emph{role indicators}. \end{goal} \medskip \begin{exampleblock}{} \begin{center} \begin{tikzpicture}[every edge/.style={link},node distance=35mm,>=triangle 45,inner sep=.5mm] \begin{scope} \node[relationship] (R) {buys-from}; \node (l) [left of=R,entity] {customer}; \draw (R) -- node[above,pos=.5] {buyer} (l); \node (r) [right of=R,entity] {shop}; \draw (R) -- node[above,pos=.5] {seller} (r); \end{scope} \end{tikzpicture} \end{center} \end{exampleblock} \medskip Role indicators improve readability! \end{frame}