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-\documentclass[11pt]{article}
-\usepackage{pgfdatabasearrows}
-\usepackage{array}
-\usepackage[margin=2.5cm]{geometry}
-
-\begin{document}
-\pagestyle{empty}
-\raggedright
-\parskip\smallskipamount
-
-\noindent\hfill Warszawa,\\
-\noindent\hfill March 16, 2006,\\
-\noindent\hfill December 16, 2006 (next try).
-
-\medskip
-
-Prof.\ Dr.\ \textbf{Till Tantau}\\
-\texttt{tantau at users.sourceforge.net}
-
-\bigskip\bigskip
-Dear Sir,
-
-\medskip
-Here are some arrow tips for drawing database entity
-diagrams.
-
-\medskip
-(The first attempt to send you them I~made on March 16, 2006 but the
-mail was rejected due to overfull of your mailbox.)
-
-(At \emph{this} attempt the \textsf{sourceforge.net} server rejects
-mails with .zip attachments :-))
-
-(At the project's site I~didn't see any encouragement for contributions
-other than becoming a~Developer which is not the case here, I~suppose.
-
-I~mean, if you'd be interested in these arrow tips and wanted me to
-describe them a~bit more, I'd still remain just a~\textsf{tikz} user.)
-
-
-\bigskip
-\newcommand*\dbarrowtest[2]{%
- #1 & \raisebox{.5ex}{\tikz[thick] \draw[#2-#2] (0,0.2) --
- (2,0.2);\ \ \tikz[thin] \draw[#2-#2] (0,0.2) --
- (2,0.2);}\\}
-
-
-\begin{tabular}{>{\ttfamily}r@{:\ \ }l}
-
-\dbarrowtest{dbplain {\normalfont alias} nulla}{nulla}
-\dbarrowtest{dbplainlong {\normalfont alias} nullalonga}{nullalonga}
-
-\dbarrowtest{dboshortt}{dboshortt}
-\dbarrowtest{dboshort}{dboshort}
-\dbarrowtest{dbo}{dbo}
-\dbarrowtest{dbolong}{dbolong}
-
-\dbarrowtest{dbbar {\normalfont (for combining)}}{dbbar}
-\dbarrowtest{db1}{db1}
-\dbarrowtest{dbo1}{dbo1}
-\dbarrowtest{db1o}{db1o}
-\dbarrowtest{dbmany}{dbmany}
-\dbarrowtest{dbomany}{dbomany}
-\end{tabular}
-%
-\quad
-%
-\begin{minipage}{.3\textwidth}
-
-And with curves:
-
-\medskip
-\newcommand*\dbarrowtestic[1]{\tikz\draw[rotate=-90,thin,#1-#1] (1,1) .. controls
-(0.4,1) and (0.6,0) .. (0,0);\ }
-
-\dbarrowtestic{nulla}
-\dbarrowtestic{nullalonga}
-\dbarrowtestic{dboshortt}
-\dbarrowtestic{dboshort}
-
-\dbarrowtestic{dbo}
-\dbarrowtestic{dbolong}
-\dbarrowtestic{dbbar}
-\dbarrowtestic{db1}
-
-\dbarrowtestic{dbo1}
-\dbarrowtestic{db1o}
-\dbarrowtestic{dbmany}
-\dbarrowtestic{dbomany}
-
-\tikz\draw[rotate=-90,thin,angle 60-angle 60] (0.5,1) .. controls
-(0.3,1) and (0.2,0) .. (0,0);
-
-\end{minipage}
-
-\bigskip
-
-I~think they may be useful for someone else.
-If there's no such arrow tips defined yet
-it would be an honour for me to see this humble package included into
-the \textsf{pgf} bundle.
-
-\medskip
-\noindent\leftline{\textbf{The `nulla' arrow tip advisability}}
-I~think something like \texttt{nulla} arrow would be useful in general
-(like Zero or Null are sometimes useful ;-) e.g., to straighten an
-ending of a~curve (compare my arrows with \texttt{angle 60} drawn last
-above).
-
-\medskip
-I~think there could be some standard arrow tips defined with a~straight
-segment in their middle so that they not look like last arrowcurve
-above but like this:
-%
-\tikz\draw[rotate=-90,thin,angle 60-angle 60] (0.5,.5) -- ++(-.1,0) .. controls
-+(-.2,0) and +(0.2,0) .. (.1,0) -- (0,0);
-
-\medskip
-Once again thanks for a~good work.
-
-\medskip
-Yours sincerely and \TeX nically,\\
-\emph{Natror (Grzegorz Murzynowski)}\\
-\texttt{natror at o2.pl}
-
-\end{document}
-
-%%% Local Variables:
-%%% mode: latex
-%%% TeX-master: t
-%%% End: