p groups
 (e.g., "<code>ou=group,dc=eclipse,dc=net</code>").
 <p>
 Needed only for a store that performs group lookup.
 Requires that the bindDn member be filled in.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Base DN for searching the LDAP tree for groups.</dd>
</dl>
<dl>
<dt>Default:</dt>
<dd>""</dd>
</dl>
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