standard project structure?

[Xavier Noria]

Say a distribution has a regular Perl module

     Foo::Bar::Baz
and another Perl module, used by the former, that is a loader:

     Foo::Bar::Baz::XSModule

so we have something like this:

    lib/Foo/Bar/Baz.pm
    lib/Foo/Bar/Baz/XSModule.pm
    lib/Foo/Bar/Baz/XSModule.xs
    Makefile.PL
    MANIFEST
    ...

With that structure make does not compile anything. Makefile.PL has  
no XS specific stuff right now (I tried to use the XS parameter of  
WriteMakefile without luck).

Which is the standard way to do that? Where do you put the .xs? What  
are MODULE and PACKAGE set to?

-- fxn