postalAddress matching rule

["Brett @Google" <brett.maxfield@gmail.com>]

Hello,

I've just submitted a patch to help make the collect overlay
(attribute inheritance) a bit more useful (ITS#5659).

As part of my testing work for the above i once accidentally created a
postalAddress attribute with two values. When i tried to remove the
extra attribute value it failed, the error i got was something like
that there is no matching rule for postalAddress, which if there
really isn't then it's probably a reasonable thing for slapd to
complain about, as it wont be able to tell the individual values of
postalAddress apart.

So to put it in a nutshell, i'm willing to have a go implementing a
postalAddress matching rule, but i was wondering if anyone has any
thoughts where i might begin, and/or any pointers as to which file(s)
implement the matching rules.

Cheers
Brett