Netscape NETSCAPE DIRECTORY SERVER 7.0, Reference

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Schema Definition
16 Netscape Directory Server Schema Reference • October 2004
Object Classes
In LDAP, an object class defines the set of attributes that can be used to define an
entry. The LDAP standard provides some basic types of object classes, including:
• Groups, including unordered lists of individual objects or groups of objects.
• Locations, such as the country name and description.
• Organizations.
• People.
• Devices.
Required and Allowed Attributes
Every object class includes a number of required attributes and of allowed
attributes. Required attributes include the attributes that must be present in
entries using the object class. All entries require the
objectClass
attribute, which
defines the object classes assigned to the entry.
Allowed attributes include the attributes that may be present in entries using the
object class.
Example: Object Class = person
Required Attributes
object class
cn (common name)
sn (surname)
Allowed Attributes
description
seeAlso
telephoneNumber
userPassword
CAUTION Directory Server fails to start if schema definitions include too few or
too many space characters.
Use exactly one space in those places where the LDAP standards
allow the use of zero or many spaces; for example, the place between
the NAME keyword and the name of an attribute type.