Page Numbers: Yes First Page: 1
Heading:

April 25, 1979 4:47 PM[IVY]<KRL>document>match-seek-old-ground

C.1.d. Grounded Descriptions (this sectino badly needs motivation)

There are various statements above that for such-and-such a case to be "simple" one of the description arguments must be grounded. A grounded description means one in which it is obvious where structurally to look for the descriptions being sought. Grounding is defined recursively as follows:

1. Labelled co-reference descriptions (unit and slot coreferences) are grounded. Furthermore the unit or slot which is pointed to is called a ground.

2. Perspectives (both unit and slot) are grounded if at least one of the descriptions in their filler pairs is grounded (note that this includes the so-called "target" description following the thatIs keyword).

For example the following descriptions are grounded (the second has 2 grounds):

A Person with friend = John
the trade from a Craftsman thatIs EricSloane with pupil = MrStone
Economics
the extraName inUnit Person23

whereas the following are not:

A Friend
A Professor with student = a Person thatIs a FriendlyType
A Person with age = 10 (since 10 is not a labelled co-reference description)