LDAP - Entry

About

Entry are the content of a LDAP directory and they represents entity or objects such as:

• people,
• organizational units,
• printers,
• documents,
• groups of people
• or anything else

LDAP deployments today tend to use Domain name system (DNS) names for structuring the topmost levels of the hierarchy.

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Structure

Entries consist of a set of attributes.

Entries have:

• a Distinguished Name (DN) (A globally unique name unique in the directory tree),
• a relative distinguished name (RDN) (A name unique among all its siblings - one the same level with the same parent)
• and attributes

Permitted attribute

The permitted attributes of an entry are determined by:

• The objectClass attribute (It specifies the object classes of an entry and is mandatory for each entry)
• The system and user schema

Mandatory Attribute

The following four attributes MUST be present in all subschema entries:

• cn: this attribute MUST be used to form the RDN of the subschema entry.
• objectClass: the attribute MUST have at least the values “top” and “subschema”.
• objectClasses: each value of this attribute specifies an object class known to the server.
• attributeTypes: each value of this attribute specifies an attribute type known to the server.