Dear Duane,
For the second of these (conflicts when the
same concept is represented by different types), can you elaborate a couple of
examples (no hurry). I just want to make sure I have a good idea of this.
MW: Well I guess representing
something that exists in space-time as a 3D or 4D individual would count.
Regards
Matthew West
Information Junction
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Duane
On 3/9/10 2:30 PM, "sean barker" <sean.barker@xxxxxxxxxxxxx> wrote:
Apologies
for slow response to a couple of requests for sources on semantic
incompatibilities.
This is the table we generated internally, based partly on older database work
Semantic
Incompatibilities
Naming
Conflicts
When
objects representing the same concept may contain dissimilar names:
conflicts due to either homonyms or synonyms.
Type
Conflicts
When
the same concept is represented by different types.
Key
Conflicts
When
different keys are assigned to the same concept in different schema.
Behavioural
Conflicts
When
different insertion/deletion policies are associated with the same class
of objects in different schemata. e.g. deleting an object may leave an
“empty” object rather than a “null reference”.
Missing
Data
When
different attributes are defined for the same concept.
Levels
of Abstraction
When
information about an entity is stored at dissimilar levels of detail.
e.g. ‘name’ versus ‘first_name’ and ‘last_name’.
Identification
of Related Concepts For example, two entities belonging to two
different databases may not be equivalent but one entity may be a
generalisation of the other entity.
Scaling
Conflicts
When
the same attribute of an entity is stored in dissimilar units.
it
is based on/taken from
[1]
Aykut
Firat, Information Integration Using Contextual Knowledge and Ontology
Merging. MIT (Sloan School of Management) Ph. D thesis, September 2003.
[1]
M.
P. Reddy, B. E. Prasad, P. G. Reddy, Amar Gupta, A Methodology for
Integration of Heterogeneous Databases, IEEE Transactions on Knowledge and
Data Engineering, Vol. 6, No. 6, December 1994.
There are some other papers dating from the mid-nineties, but they have not
survived my various office moves.
Sean
Barker
Bristol
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