parid0158 | Tue, 25 Feb 2003 17:04:28
In any given assertion, each role type is either played by a single subject, represented by a single node, or the role type is "unplayed", i.e., the role type has no role player. Multiple subjects cannot play the same role in the same assertion.
Node are already required to represent a single subject. So,
multiple subjects could not play the same role in the same assertion by
definition. Yes, roles are either played or not, not sure I need a
section on that idea. Note use of role and not role type.