1 Photo - Nov 8, 2012
Photo: Railroad diagrams. +Tab Atkins Jr. made a tool for generating them—ones that have the same “visual appeal” as those used on JSON.org. Source at https://github.com/tabatkins/railroad-diagrams and real-world examples at http://www.xanthir.com/etc/railroad-diagrams/example.html and in the CSS Syntax spec http://dev.w3.org/csswg/css3-syntax/#token-diagrams