<Group>
The Group class, which was not fully developed before I retired,
allows us to describe things, such as Family, Organization, Household,
etc.. Group might be implemented as an abstract class with its sub-
classes "Family", ect. inheriting its general features.  The Group, or
if implemented as an abstract class, its sub-classes would generally
have structures somewhat similar to <Record>.  In fact, we originally
described families, households and organizations as Records.  We were
uneasy with that.  It now seems that Group is a more approprate object
to use for these types of entities.

Structure:
<Group type = "Family"</Group>
  <Attribute type = "[type]" . . . </Attribute> [1-M]
  <Event type = "[type]" . . . </Event> [commonly the marriage and
divorce events]
  <Persona> . . . </Persona> [1-M]
  <Reference type = "[type]> . . . </Reference>
  . . .
</Group>