saw it on the json page as well<p><a href="http:&#x2F;&#x2F;json.org&#x2F;" rel="nofollow">http:&#x2F;&#x2F;json.org&#x2F;</a><p>but I&#x27;m not into grammars. I used antlr once, and they did support that as well in the designer <a href="http:&#x2F;&#x2F;www.antlr3.org&#x2F;works&#x2F;screenshots&#x2F;ambiguouspath.jpg" rel="nofollow">http:&#x2F;&#x2F;www.antlr3.org&#x2F;works&#x2F;screenshots&#x2F;ambiguouspath.jpg</a>