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OpenSolaris: This is the source base for Solaris development.
Currently, it consists of several technology components called consolidations.
See the Downloads Page for details on the technologies that have been released,
and the OpenSolaris Roadmap for the schedule of upcoming technology releases.
At present, the OpenSolaris source base is not enough to bootstrap an entire system,
so developers start by downloading an OpenSolaris distribution and installing the OpenSolaris bits on top.
たぶんこれだな

でもこれは
So, Solaris is a product supported by a company;
OpenSolaris is a development project run by an community of developers.
この文章と齟齬をきたしているようにおもえる。
それとも
OpenSolarisとはプロジェクトであり、かつまたザソースベースでもあるのだろうか。

#ザソースベースって何？という疑問もあるけどそれはまた別の話