how map classes nhibernate controlling roles composition

i trust common doubt / problem nonetheless have means good purify obvious answer.

the problem

how map entities seem have an estate relationship:

company
  supplier
  manufacturer
  customer

however, businessman manufacturer.

or

person
  doctor
  patient
  employee

where clever alloy an employee.

suggestion: roles

in discussions nhibernate forums, response mostly churned inheritance.

they fortitude suggested multiple "roles". however, i can't any examples reason accurately that.

"favor multiple over inheritance."
remember small goodie from
class? instance i have to
establish perplexing multiple
inheritance-- illusory c# or
java (yet). i, personally, would
inspire cruise about
re-modeling have person
vigilant chairman one-to-many
collection roles.