I have not yet added indentation sensitivity to the parser (although the tokenizer saves the indentation information for the parser), but the initial prototype parses all of JSON plus a lot of syntax enhancements (comments, hex/binary/octal numbers, relaxed quoting requirements for strings, trailing comments allowed, triple-quoted strings, etc.)
I have also started the rson-discuss group on google for further discussions on the actual syntax and initial implementation, if anyone is interested, and have posted a message there with a bit more information about the prototype status. The project page is at http://code.google.com/p/rson/ Best regards, Pat -- http://mail.python.org/mailman/listinfo/python-list