and i have added these additional members in the default core.schema :
objectclass ( 1.3.6.1.4.1.1466.101.120.111 NAME 'extensibleObject' DESC 'RFC2252: extensible object' SUP top AUXILIARY )
attributetype ( 2.16.840.1.113730.3.1.34 NAME 'ref' DESC 'named reference - a labeledURI' EQUALITY caseExactMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 USAGE distributedOperation )
objectclass ( 2.16.840.1.113730.3.2.6 NAME 'referral' DESC 'named subordinate reference object' STRUCTURAL MUST ref )
(0) Don't edit core.schema, as OpenLDAP may ship a new one in a future release. Leave your local schema in local files.
(1) These objects are hard coded in schema_prep.c. They are standardized OIDs. They do not need to be redefined in core.schema, and were not there for this reason.
(2) These are standardized definitions. Do not attempt to modify them. Obtain your own OID arc if necessary. See the relevant RFCs for details.