some questions about the ORG Ontology

Dear All,

I have some questions about the ORG Ontology:

Can Posts contain sub Organizational Units? This is currently allowed in the
ontology, but does not seem to make sense to me when I think of applications
and the intuitive connotation of Post. (I am still trying to make sense of
what are the benefits of Post being a subclass of Organization. The fact
that a Post can be held by multiple people does not seem to be enough, since
Post could also be a direct subclass of foaf:Agent, in which case it could
be a foaf:Group.)

What is the difference between hasSubOrganization - when used between
org:Organization and org:Post - and hasPost (which has domain Organization
and range Post)? If there is no difference (and if one insists that Post is
a subclass of Organization) shouldn't org:hasPost be a subproperty of
org:hasSubOrganization (just like  org:hasUnit is)?

If an agent is a member of a sub organization (O2), which is a sub
organization of an organization (O1), is the agent also a member of O1?

Suppose that we're talking about a particular University, e.g., "The Federal
University of Espírito Santo". Would we then have different Posts for each
of the "Associate Professors" that are members of the university?

Is organization (domain org:Membership, range foaf:Agent) a functional
property? (I think so.)

Is organization (domain org:Membership, range org:Organization) a functional
property? 

Is role (domain org:Membership, range org:Role) a functional property?

regards,
João Paulo