Hm, my immediate thought was that it would be written like TeX, e.g.: \p{Hello, \a[http://example.com]{world}} This doesn't quite match what he's saying b

Hm, my immediate thought was that it would be written like TeX, e.g.: \p{Hello, \a[http://example.com]{world}} This doesn't quite match what he's saying but I think it's a little more readable than your version.