How to use DMBS_LDAP to select 3 attributes for selected entries

I'm attempting to use DBMS_LDAP to create a procedure in Oracle 11.2.0.2.0 that ultimately updates an employee table from active directory.

The attributes I want are sAMAccountName, GivenName, and sn.

The variable that is used so store the searched attributes is:

l_attrs        DBMS_LDAP.string_collection;

so far I've seen people use:

l_attrs(1) := '*';

&

l_attrs(1) := 'sAMAccountName';

This allows me to get all or 1 attributes for a given entry but I certainly don't want all the attributes.

My question is, is there a way to specify multiple attributes?

Thanks,