Support for RELAX NG Compact XML schema language (rnc)
RNC is very compact, non-XML language. I couldn't find any approximate highlighting with existing Pygments languages (DTD, BNF, Python). The highlighting already exists in Vim, and I like it. Could you port it, please?
I am also thinking about contributing this highlighting if it doesn't already exist in Pygments and if nobody else beats (you are very welcome though) me.