Comment on doc/sphinx/phk/backends.rst : "wildcard'isch scheme"

[Nils Goroll]

Hi Poul-Henning,

you were asking for comments on your idea to have a "wildcard-ish scheme" for
accessing backend-specific information from a VCL.

IMHO, the following problem exists: Wenn a VCL is added, the semantics of
something like b1() changes (when the new VCL defines a different b1 than the
existing VL), and an old but active VCL might not know how to handle more
backends than it defined itself.

For the default case, I think it is important that, within a VCL, only those
backends are visible which were defined within that VCL.

Should backend polling become controllable from a VCL, having some special
notation to access other VCLs' backends might be useful.

Nils