I can definitely relate, trying to write a YAML parser - REALLY hard (151 ebnf rules). Writing a XML spec compliant parser - hard. This goes double for validat

I can definitely relate, trying to write a YAML parser - REALLY hard (151 ebnf rules). Writing a XML spec compliant parser - hard. This goes double for validating parser (81 ebnf rules + VC and WFC rules). Writing a XML spec that disregards DTD - managable. Modifying it to parse DTD - still managable (unless doing in-situ parsers). Writing OGDL parser - fun :D (~18 ebnf rules)