Drawing a connector from and to the same node

[hm-raws]

Hello,
Thanks for this great package! I was wondering whether it is possible to draw a connector from and to the same node? This would be useful if we wanted to draw an object property connector that has the same class as its domain and range, for example.

[mhoangvslev]

Sorry for late comment but here is one solution:

• In tikz-graffoo, do this:

\newcommand{\gObjectProperty}[4][]{%
	\draw[object-property] (#2) to[#1] node[midway,fill=white] {#4} (#3);
}

• There are 4 args in total: optionals, subject, object and predicate
• If optional is empty then the edge will be straight and an arc if not.