sub-module support

[Saravanan Shanmugham (sarvi)]

Hi,
    We are considering moving to a DSCM within in our group, and would
like to start with a few trial projects. If we find the model working,
we will expand its usage.
 
The choices are obviously between GIT and Mercurial. Windows support is
good on Mercurial. But the concept of versioning sub-modules seems to
tilt in favour of GIT.
 
We expect our code base to be large but modular, in that we expect to
version sub-components independently. That is we do not want to have to
version our entire code base together. Sub components need to be shared
amoungst multiple higher level modules and platforms. 
 
We could like to be able to checkout and develop submodules
independently. While also in certain cases want to manage a collection
of sub-modules as a platform or higher level module,  and be able to
version them together as well.
 
Git has sub-modules as part of the core system now. 
 
Mercurial has Forest extension support, but that seems second tier i.e.
not part of the standard. Plus a note on the page says its not working.
 
So, can anyone tell what the Mercurial story  is with respect to
managing sub-projects/sub-modules in the code base.
 
Thanks,
Sarvi  
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