96 lines
5.4 KiB
HTML
96 lines
5.4 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="dc.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-06" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<title>Directory Server (LDAP) - Object classes</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="rzahyobjectclass"></a>
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<h3 id="rzahyobjectclass">Object classes</h3>
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<p>An object class specifies a set of attributes used to describe an object.
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For example, if you created the object class <span class="bold">tempEmployee</span>, it could contain attributes associated with a temporary employee such
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as, <span class="bold">idNumber</span>, <span class="bold">dateOfHire</span>, or <span class="bold">assignmentLength</span>. You
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can add custom object classes to suit the needs of your organization. The
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IBM Directory Server schema provides some basic types of object classes, including: </p>
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<ul>
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<li>Groups</li>
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<li>Locations</li>
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<li>Organizations</li>
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<li>People</li></ul>
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<a name="wq10"></a>
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<div class="notetitle" id="wq10">Note:</div>
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<div class="notebody">Object classes that are specific
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to the Directory Server have the prefix 'ibm-'.</div>
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<p>Object classes are defined by the characteristics of type, inheritance,
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and attributes.</p>
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<p><span class="bold">Object class type</span></p>
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<p>An object class can be one of three types:</p>
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<dl>
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<dt class="bold">Structural:</dt>
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<dd>Every entry must belong to one and only one structural object class,
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which defines the base contents of the entry. This object class represents
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a real world object. Because all entries must belong to a structural object
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class, this is the most common type of object class.
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</dd>
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<dt class="bold">Abstract: </dt>
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<dd>This type is used as a superclass or template for other (structural)
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object classes. It defines a set of attributes that are common to a set of
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structural object classes. These object classes, if defined as subclasses
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of the abstract class, inherit the defined attributes. The attributes do not
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need to be defined for each of the subordinate object classes.
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</dd>
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<dt class="bold">Auxiliary: </dt>
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<dd>This type indicates additional attributes that can be associated with
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an entry belonging to a particular structural object class. Although an entry
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can belong to only a single structural object class, it might belong to multiple
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auxiliary object classes.
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</dd>
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</dl>
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<p><span class="bold">Object Class Inheritance </span></p>
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<p>This version of the Directory Server supports object inheritance for object
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class and attribute definitions. A new object class can be defined with parent
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classes (multiple inheritance) and the additional or changed attributes.</p>
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<p>Each entry is assigned to a single structural object class. All object
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classes inherit from the abstract object class <span class="bold">top</span>. They can also inherit from other object classes. The object class
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structure determines the list of required and allowed attributes for a particular
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entry. Object class inheritance depends on the sequence of object class definitions.
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An object class can only inherit from object classes that precede it. For
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example, the object class structure for a person entry might be defined in
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the LDIF file as: </p>
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<pre class="xmp">objectClass: top
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objectClass: person
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objectClass: organizationalPerson
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</pre><p class="indatacontent"> In this structure, the organizationalPerson inherits from the person
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and the top object classes, while person object class only inherits from the
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top object class. Therefore, when you assign the organizationalPerson object
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class to an entry, it automatically inherits the required and allowed attributes
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from the superior object class (in this case, the person object class).</p>
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<p>Schema update operations are checked against the schema class hierarchy
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for consistency before being processed and committed.</p>
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<p><span class="bold">Attributes</span></p>
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<p>Every object class includes a number of required attributes and optional
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attributes. Required attributes are the attributes that must be present in
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entries using the object class. Optional attributes are the attributes that
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can be present in entries using the object class.</p>
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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