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sn: Jensen
givenName: Babs
givenName: Barbara
mail: bjensen@example.com
The entry for Babs contains multiple values for some of the attributes. The attribute
appears twice, each time with a unique value. The object classes that
givenName
appear in this example are explained in the next section, "Standard Object Classes."
In the schema, each attribute definition contains the following information:
•
A unique name.
•
An object identifier (OID) for the attribute.
•
A text description of the attribute.
•
The OID of the attribute syntax.
•
Indications of whether the attribute is single-valued or multi-valued, whether
the attribute is for the directory's own use, the origin of the attribute, and any
additional matching rules associated with the attribute.
For example, the
attribute definition appears in the schema as follows:
cn
attributetypes: ( 2.5.4.3 NAME 'cn' DESC 'commonName Standard
Attribute' SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
Standard Object Classes
Object classes are used to group related information. Typically, an object class
represents a real object, such as a person or a fax machine. Before you can use an
object class and its attributes in your directory, it must be identified in the schema.
Your directory recognizes a standard list of object classes by default. See the Red
Hat Directory Server Schema Reference for more information.
Each directory entry belongs to one or more object classes. Once you place an object
class identified in your schema on an entry, you are telling the Directory Server
that the entry can have a certain set of attribute values and must have another,
usually smaller, set of attribute values.
Object class definitions contain the following information:
•
A unique name.
•
An object identifier (OID) that names the object.
•
A set of mandatory attributes.
Standard Schema
Chapter 3
How to Design the Schema
47
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