Submissions:Enlarge Class Definition for Resolving Disjointness due to Subsomption

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Current revision ID: 8964

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Diagram

Image:Djedidi LOP2 WOP09.pdf

General information

Name Enlarge Class Definition for Resolving Disjointness due to Subsumption.
Also known as
Author(s) Rim DJEDIDI
SubmittedBy RimDjedidi


Description

Motivation Problem :

This pattern helps resolving a logical inconsistency triggered by a situation of disjoint classes subsuming a common sub-class. When we need to define – for some modeling issues related to domain of interest – a class as a sub-class of two disjoint classes, a disjointness inconsistency is caused. The problem can be illustrated by the following scenario: let’s consider a class Sub_Class defined as a sub-class of a class Disjoint_Class 2; and a class Disjoint_Class 1 disjoint with the Disjoint_Class 2 (see diagram in attached file). If we need to add a sub-class relation between the Sub_Class and the Disjoint_Class 1, this generates a disjointness inconsistency:

- If the extension of the Sub_Class contains individuals instantiating this sub-class, the logical inconsistency will be extended to the knowledge base; - If the Sub_Class is not instantiated to individuals, it will be diagnosed as an unsatisfiable class.

To solve this inconsistency, one can think about deleting the disjointness axiom. However, this can alter the semantics expressed in the ontology, and negatively affect consistency checking and automatic evaluation of existing individuals as explained in [1]. This pattern tackles the questions of how to resolve the inconsistency caused by such kind of subsumption while preserving existing knowledge.

[1] Völker, J., Vrandecic, D., Sure, Y., Hotho, A.: Learning Disjointness. In F., Enrico, K., Michael, May. Wolfgang (Eds.). Proceedings of the 4th European Semantic Web Conference, ESWC 2007. LNCS: Vol. 4519 pp: 175-189. (2007)

Aim Intent: The purpose of this pattern is to support the semantics of a subsumption defined under two disjoint classes and resolve the resulting inconsistency.

Covered Requirements: The pattern solves a problem of disjointness inconsistency caused by a subsumption relation without deleting the disjointness axiom so that existing knowledge can be preserved.

Solution description The pattern resolves a disjointness inconsistency –caused by a subsumption– by enlarging the definition of the sub-class object of the disjointness inconsistency, based on the definition of the involved disjoint classes. The definition of the sub-class is enlarged by the union (OR) of the definitions of the disjoint classes.

The application of the solution can be described by the following process (see diagram in attached file): 1) The pattern enlarges the definition of the sub-class object of the disjointness inconsistency by defining –in its description– a union of the definitions of the disjoint classes involved in the inconsistency to be resolved.

Elements the following elements are manipulated by the pattern:

ID of the sub-class to enlarge (Sub_Class). ID of the first disjoint class (Disjoint_Class 1). ID of the second disjoint class (Disjoint_Class 2).

Implementation
Reusable component
Component type


Example

Problem example Let’s consider the OWL ontology O defined by the following axioms:

{Animal ⊑Fauna-Flora, Plant ⊑Fauna-Flora, Carnivorous-Plant ⊑Plant, Plant ⊑ Not(Animal)}

If we apply a change to the ontology defining Carnivorous-Plant class as a sub-class of the class Animal, we cause a disjointness inconsistency. The proposed pattern resolves this kind of inconsistency.

Pattern solution example
Consequences The application of the pattern to resolve the example above is performed as follow:

1) The pattern enlarges the definition of the sub-class object of the disjointness inconsistency Carnivorous-Plant by defining –in its description– a union of the definitions of the disjoint classes involved in the inconsistency: the classes Animal and Plant.


Pattern reference

Origin
Known use This pattern is proposed as another solution to the problem solved by the Logical OP "Define Hybrid Class Resolving Disjointness due to Subsumption"
Reference
Related ODP
Used in combination with
Test

Additional information

Scenarios

Scenarios about Enlarge Class Definition for Resolving Disjointness due to Subsomption

No scenario is added to this Content OP.

Reviews

Reviews about Enlarge Class Definition for Resolving Disjointness due to Subsomption
Review article Posted on About revision (current is 8964)
MariCarmenSuarezFigueroa about Enlarge Class Definition for Resolving Disjointness due to Subsomption 24550838 September 2009 56245,624
WimPeters about Enlarge Class Definition for Resolving Disjointness due to Subsomption 24550849 September 2009 57315,731
MariCarmenSuarezFigueroa about Enlarge Class Definition for Resolving Disjointness due to Subsomption 2 24550838 September 2009 57315,731
FrancoisScharffe about Enlarge Class Definition for Resolving Disjointness due to Subsomption 245508611 September 2009 58005,800

This revision (revision ID 8964) takes in account the reviews: none

Other info at evaluation tab


Modeling issues

Modeling issues about Enlarge Class Definition for Resolving Disjointness due to Subsomption

There is no Modeling issue related to this proposal.


References

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Submission to event

WOP2009:Main

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