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I think two types of authentications is reasonable as we have two types of authentication mechanisms (GSI and VOMS).  I don't view these as authorization DBs as they simply populate fields in the XrdSecEntity and don't make authorization decisions.

One interesting question is precedence: currently, GSI and VOMS fill in mutually-exclusive fields in the XrdSecEntity for making authorization decisions.  If both could fill in the `user` field, which should "win"?  GSI over VOMS seems reasonable to me (and what's been done in the past).

It is possible (and not entirely irrational) to have a unified mapfile which has both VOMS FQAN and GSI DN's intermixed.  That is more flexible than independent mechanisms but I can see the possibility for confusion.

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