Thanks Matthew!
D
On 3/9/10 11:35 PM, "Matthew West" <dr.matthew.west@xxxxxxxxx> wrote:
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
Tel: +44 560 302 3685
Mobile: +44 750 3385279
matthew.west@xxxxxxxxxxxxxxxxxxxxxxxxx <mailto:matthew.west@xxxxxxxxxxxxxxxxxxxxxxxxx>
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This email originates from Information Junction Ltd. Registered in England and Wales No. 6632177.
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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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Twitter – http://twitter.com/duanechaos
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