module dependency

[Alan Bateman]

Joe Wang wrote:
> Hi,
>
> I have a question about the module system's support on module 
> dependencies. A module can specify that it "require" or depends on 
> other modules. Is it possible to express the sort of one to many 
> relationship in that M4 requires M1 or M2 or M3 and at least one of 
> them. If that's possible, it would also be nice to be able to find 
> out, through a jigsaw interface, which module (of M1, M2 and M3) has 
> been installed by querying M4 (by module name or id). Is this possible?
>
> Thanks,
> Joe
This is JAXP, right? Do M1, M2, and M3 provide alternative 
implementations of a module that M4 requires? If so then the virtual 
module support may help with some of this.

-Alan.