Re: [ANNOUNCE] GIT 1.5.2-rc3

> * Plumbing level subproject support.
>
>   You can include a subdirectory that has an independent git
>   repository in your index and tree objects as a
>   "subproject".  This plumbing (i.e. "core") level subproject
>   support explicitly excludes recursive behaviour.
>
>   The "subproject" entries in the index and trees are
>   incompatible with older versions of git.  Experimenting with
>   the plumbing level support is encouraged, but be warned that
>   unless everybody in your project updates to this release or
>   later, using this feature would make your project
>   inaccessible by people with older versions of git.