Grep and diff just aren't suited to dealing with nested data structures where whitespace and/or newlines are irrelevant. There's some data that's intrinsically

Grep and diff just aren't suited to dealing with nested data structures where whitespace and/or newlines are irrelevant. There's some data that's intrinsically nested, and we can't really simplify the world to make parsing easier. A good CFG engine like the article proposes would be very useful.