Models: Schema references to undefined entities

[Hallvard B Furuseth <h.b.furuseth@usit.uio.no>]

In [Models], please specify whether the various schema elements
may refer to OIDs of entities that are not defined in the schema.
E.g. an objectclass with "MAY (<oid of undefined attribute>)", an
attribute type with an undefined syntax, a DIT content rule with
an undefined objectclass in the "AUX" part, etc.

Such undefined entities wouldn't be useful for anything in the
directory, but it could be useful to allow them in the schema
because a schema element could be defined without defining
everything it depends on.  For example, an attribute type defined
by the server's standard setup may have to be omitted because of 
a name conflict with a locally defined attribute type.  One could
edit the attribute out of the object class which uses it as well,
but that's uglier since clients would receive an incorrect
definition of that object class.

-- 
Hallvard