net.sf.hibernate.QueryException: expecting 'elements' or 'indices'

hi,
sorry for my stupid questions, but I really do not have the slightest idea how to elegantly query many:many relations.

Assume I have a m:m mapping Person[uid, name] : Group[uid, name]. I want to retrieve all People that are member of Group "ABC"

------------------
hbm for Person:
---------------------
<set name="groups"
table="HIB_GROUPS_UID_PEOPLE_UID"
lazy="true"
inverse="false"
cascade="none"
sort="unsorted"
>
<key column="PEOPLE_UID" />
<many-to-many
class="org.xinity.ams.GroupsStub"
column="GROUPS_UID"
outer-join="auto"
/>
</set>
------------------
hbm for Groups:
---------------------
<set name="people"
table="HIB_GROUPS_UID_PEOPLE_UID"
lazy="true"
inverse="false"
cascade="none"
sort="unsorted"
>
<key column="GROUPS_UID"/>
<many-to-many
class="org.xinity.ams.PersonStub"
column="PEOPLE_UID"
outer-join="auto"
/>
</set>

I am doing so, using:

net.sf.hibernate.Query q = sess.getHibernateSession().createQuery("from c in class Groups where c.name=?");
q.setString (0, name);
q.list().iterator.next().getPeople()


The problem is: I want to query for some Person-attributes like ZIPCode etc., too. In a single query. So I want to do s.th. like

"where c.zipCode = 12345 AND c.groups.name = "ABC"

but I am getting a
expecting 'elements' or 'indices' after: c.groups.name [from c in class Person WHERE(c.groups.name = 'ABC')]

What am I doing wrong?

something like

select emp
from Empolyee as emp
join emp.groups as group
where emp.xxx=yyy and group.name='ABC'