reftex-default-bibliography: first local files then global ones

[Uwe Brauer]

Hi

When using bibtex+refte, I usually have one data base placed in my local texmf 
tree
,----
| 
| reftex-default-bibliography is a variable defined in ‘reftex-vars.el’.
| Its value is ("/home/oub/texmf/bibtex/bib/bibgraf.bib")
| Original value was nil
`----

However lately in collaboration (using mercurial) we end up having a
local bibfile (which sits in the main directory of the collaboration)
that is much smaller than my global one.

It is not clear to me, reading the documentation of the variable 
reftex-default-bibliography, how to configure it, so that it takes,
first the «local» bibfile and if there is none to take the global one.
Should I use the expression {.}  to indicate the local one?

Thanks

Uwe Brauer

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