It's appositival, if it's there. And it doesn't have to be there. And it's really obvious that it's there when it's there.
Larry WallThe problem with being consistent is that there are lots of ways to be consistent, and they're all inconsistent with each other.
Larry WallHuman languages tend to be much more ambiguous than computer languages because humans are much smarter about interpreting the context.
Larry WallWhen they first built the University of California at Irvine they just put the buildings in. They did not put any sidewalks, they just planted grass. The next year, they came back and put the sidewalks where the trails were in the grass. Perl is just that kind of language. It is not designed from first principles. Perl is those sidewalks in the grass.
Larry Wall