Database Reference
In-Depth Information
Altby
B1
B2
B3
B4
B5
B7
B13
B6
B9
B10
B11
B8
B14
B12
B16
B17
B18
We st Chine
FIGURE 10.8
Areas of overlapping perceptions of West Chine and Altby.
properties as attractively as possible for sales purposes and the police who commu-
nicate with local people and who have different views of what is in which area. So,
if it is generally known that West Chine is “posher” than Altby, estate agents have
a tendency to expand the West Chine area at the expense of Altby to imply more
properties are included in the posher area. People living in the area, however, are
more likely to use different criteria, perhaps discriminating by social group, building
type, or historical continuity, and as a result this view is more likely to be reflected
by the police.
Altby has part B4.
Altby has part B5 (and so on)
Altby may have part B9.
…
Altby may have part B14.
Individual: Altby
Facts: hasPart B4
Individual: Altby
Facts: hasPart B5
Individual: Altby
Facts: mayHavePart B9
…
Individual: Altby
Facts: mayHavePart B14
Similarly, West Chine may also be described as maybe having B9-B11 and B14.
This allows queries to be executed that return all the features that could possibly be
part of a locality by using the “has part” property and just those that may be a part by
using the “may have part” subproperty. What this does not allow for is the ability to
ask for just the Features that are definitely part of a Locality, at least not in a straight-
forward manner. We can get this result by finding the inverse of the intersection of
