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Re: Add-if-not-present

>>> Soft Del: The attribute shall contain none of these values, but might
>>> have
>>> others
>> I'm not sure I understand how SOFTDEL differs from LDAP_MOD_DELETE.  Do
>> you mean that values listed in SOFTDEL will be deleted if they exist, or
>> otherwise ignored?
> Yes; LDAP_MOD_DELETE requires that the listed values exist.  The
> delete-all-values case is separate.  If we had
> cn: a
> cn: b
> and ran
> changetype: modify
> softdel: cn
> cn: b
> cb: c
> Then the result would be success and cn=a remaining.  Yes, this is useful!

Protocol-wise, this is what permissive modify control is intended for.  I
concur that having this as an internal modification (much like
SLAP_MOD_SOFTADD) would allow finer grain control to internal operations,
without (ab)using the permissive control.  The same, in terms of
granularity, applies protocol-wise.