The schema provided with Directory Server is described in a set of files that are stored in the instance-path/config/schema/directory.
This directory contains all of the common schema for Directory Server and related products. The LDAP v3 standard user and organization schema is located in the 00core.ldif file. The configuration schema used by earlier versions of the directory is located in the 50ns-directory.ldif file. The user created elements such as objectclasses and attributes are stored in 99user.ldif.
Do not modify files in this directory. To manage Directory Server schema, use the ldapmodify(1) command.