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    <h3>The Root DSE and possible base DN of the schema</h3> <p>Assuming that the LDAP client only cares what attributes are defined in the schema (see <code>extensibleObject</code> below), to determine if an <code>attribute</code> is defined in the server schema, retrieve the schema. In many directory servers, the base DN (or base object) for the schema is defined in the attribute <code>subSchemaSubEntry</code> which might be present in the root DSE. For more information about the root DSE, see <a href="https://ff1959.wordpress.com/2011/04/11/the-root-dse-is-that-entry-with-zero-rdns-and-contains-information-about-the-directory-server/" rel="nofollow">LDAP: The Root DSE</a>. To retrieve the contents of the root DSE, transmit a search request to the server consisting of a base object of <code>''</code> and a search scope of <code>base</code>, and a requested attribute list consisting of <code>*</code> and <code>+</code>.</p> <h3>extensibleObject</h3> <p>Note that the presence of the objectClass <code>extensibleObject</code> allows LDAP clients to add any attribute name and value they require, much like a FORTRAN garbage common block, that is, attributes could be present in an entry but not defined in the schema.</p> <h3>subSchemaSubEntry not present</h3> <p>If the <code>subSchemaSubEntry</code> attribute is not present, contact the server administrators and ask for information regarding retrieving the schema and for sufficient access rights to do so.</p> <h3>subSchemaSubEntry present</h3> <p>If the <code>subSchemaSubEntry</code> attribute is present, read the schema by transmitting a search request to the server using the value of the <code>subSchemaSubEntry</code> attribute as the base object, a search scope of <code>one</code> and a requested attribute list consistent of <code>*</code> and <code>+</code>. The attribute type definitions and objectClass definitions are contained in the schema.</p>
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