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eXo User profiles also have entries in the LDAP but the actual storage is still done with the hibernate service. You will need the following parameters:
<field name="profileURL">
<string>ou=profiles,ou=portal,dc=exoplatform,dc=org</string>
</field>
<field name="profileLDAPClasses">
<string>top,organizationalPerson</string>
</field>
profileURL: base dn to store user profiles.
profileLDAPClasses: Classes used for creating user profiles.