Multiple provisioned objectclasses are supported by separating ldap-object-class values with whitespace in either the group-attribute-mapping or resolver-attribute-mapping configuration :

<group-attribute-mapping ldap-object-class="groupOfNames inetLocalMailRecipient">
<group-attribute-map group-attribute="description" ldap-attribute="description" />
</group-attribute-mapping>

or

<resolver-attribute-mapping ldap-object-class="groupOfNames inetLocalMailRecipient">
<resolver-attribute-map resolver-attribute="description" ldap-attribute="description" />
</resolver-attribute-mapping>