Schema for Mac OS X attributes?

["Michael Bartosh" <mbartosh@heavy.mabaleb.org>]

Does anyone know of a pre-defined schema for Mac OS X-specific 
attributes?

ie attribute entries (oid, EQUALITY and Syntax) for home_loc and 
applemail?

homeDirectory maps pretty well to Apple's NFSHome. I'd like to harvest 
Auth information via DirectoryServices, since this method is supported 
by Apple, and since I've gotten it work with iPlanet and ActiveDirectory.

I'm thinking probably a new schema, with an objectclass something like 
this:

objectclass ( 1.3.6.1.1.1.2.0 NAME 'mosxAccount' SUP top AUXILIARY
        DESC 'Abstraction of account for Mac OS X'
        MUST ( homeDirLoc )
        MAY ( applemail ) )

...and:

attributetype ( (what goes hee?) NAME 'homeDirLoc'
        DESC 'Apple's XML blob for finding a home dir'
        EQUALITY caseExactIA5Match
        SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 SINGLE-VALUE )

attributetype ( (what goes hee?) NAME 'applemail'
        DESC 'Apple's XML blob for mail prefs'
        EQUALITY caseExactIA5Match
        SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 SINGLE-VALUE )

Can I arbitrarily define an oid? In iPlanet, I believe a unique oid was 
suggested when we added the attribute. AD did not require one- I just 
defined hom_loc as an optional user property.

(while I'm at it, will the above work for the hom_loc and applemail 
syntax?)

Ideas ?

Thanks-