lucy24 - 7:40 am on Nov 6, 2012 (gmt 0)
the Axiom of URI Opacity
Aren't axioms fun? They're the scientist's equivalent of "Because I say so, that's why." But calling something an axiom doesn't make it so; this isn't a+b = b+a we're talking about. You could with equal propriety use the linguistic model of marked vs. unmarked. There's more than one way to approach the same subject.
The file index.php may not in and of itself have user-viewable content. What it does have is a physical existence on the server.