I think a heirarchy is a good idea for namespacing in general. I've always wanted to be able to tie namespaces in Perl 5. It would only make sense that if I tie Foo::, that Foo::anything:: would also go through that tie to get the anything:: stash.
What do you mean by "tie" here? Are you talking about namespace aliasing, so that I can alias "Foo" to "A::B::C::D::E", so that I can say "Foo::bar" rather than "A::B::C::D::E::bar"? If so, it seems that this would work with or without a hierarchical structure. Definitely useful, though.
Tying a namespace will involve allowing a namespace to basically hide
its implementation, have a custom lookup routine, back-store its symbols, etc.
I might tie a namespace to an Oracle database, so a lookup is really a callout to
database code.
my $foo = Oracle::Instance::DEV1::db_block_buffers;
The namespace lookup in Oracle::Init checks the Oracle config parameters which is external code.
All sorts of neat possibilities. :)
-Melvin
