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| − | |Motivation=The symmetric n-ary relationship pattern emerged from the need of modelling distances among two points. | + | |Motivation=The symmetric n-ary relationship pattern emerged from the need of modelling distances among two points. |
| − | |Aim=This pattern allows representing symmetric n-ary relationships, i.e. binary relationships between two elements that need a further argument that has the same value for both directions of the relationship. If SNAry is the symmetric n-ary relationship and z is its value for the elements x and y, then: | + | This problem is a clear case of an n-ary relationship where the relation between two points needs a further argument to represent the distance between such points. |
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| + | Once we have applied the n-ary pattern for this use case (http://www.w3.org/TR/swbp-n-aryRelations/#useCase1), we can realize that the origin and the destination of the n-ary relation belong to the same class. In addition, the value for the relationship is the same to represent the distance from A to B and vice-versa. Then, if we want to represent both distances we should instanciate the pattern twice, from A to B and vice-versa, resulting in a redundant representation. | ||
| + | |Aim=This pattern allows representing symmetric n-ary relationships, i.e. binary relationships between two elements that need a further argument that has the same value for both directions of the relationship. | ||
| + | If SNAry is the symmetric n-ary relationship and z is its value for the elements x and y, then: | ||
SNAry(x,y)=z iff SNAry(y,x)=z | SNAry(x,y)=z iff SNAry(y,x)=z | ||
| − | |Solution= | + | |Solution=A class to represent the n-ary relationship together with the value for the further needed argument (Relationship or Attribute) has been created. |
| + | A relationship between the abovementioned class and the classes involved in the symmetric n-ary relationship is created. | ||
|Elements=Class, Relationship, Attribute | |Elements=Class, Relationship, Attribute | ||
Axioms: cardinality and equivalentClass | Axioms: cardinality and equivalentClass | ||
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|ProblemExample=For example, we might want to represent the distance expressed in kilometres between two places. | |ProblemExample=For example, we might want to represent the distance expressed in kilometres between two places. | ||
|SolutionExample=http://ontologydesignpatterns.org/wiki/images/b/bd/Symmetric_n-ary_relationship_distance.jpg | |SolutionExample=http://ontologydesignpatterns.org/wiki/images/b/bd/Symmetric_n-ary_relationship_distance.jpg | ||
| − | |Consequences=The main advantage of this pattern is that allows representing distance between places without | + | |Consequences=The main advantage of this pattern is that allows representing distance between places without including redundancy in the ontology. |
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{{Logical OP Reference Template | {{Logical OP Reference Template | ||
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Last modified date is: 2010-09-01 |
Diagram
| Name | Symmetric n-ary relationship |
|---|---|
| Also known as | |
| Author(s) | MariaPoveda, MariCarmenSuarezFigueroa |
| SubmittedBy | MariaPoveda, MariCarmenSuarezFigueroa |
| Motivation | The symmetric n-ary relationship pattern emerged from the need of modelling distances among two points.
This problem is a clear case of an n-ary relationship where the relation between two points needs a further argument to represent the distance between such points. Once we have applied the n-ary pattern for this use case (http://www.w3.org/TR/swbp-n-aryRelations/#useCase1), we can realize that the origin and the destination of the n-ary relation belong to the same class. In addition, the value for the relationship is the same to represent the distance from A to B and vice-versa. Then, if we want to represent both distances we should instanciate the pattern twice, from A to B and vice-versa, resulting in a redundant representation. |
|---|---|
| Aim | This pattern allows representing symmetric n-ary relationships, i.e. binary relationships between two elements that need a further argument that has the same value for both directions of the relationship.
If SNAry is the symmetric n-ary relationship and z is its value for the elements x and y, then: SNAry(x,y)=z iff SNAry(y,x)=z |
| Solution description | A class to represent the n-ary relationship together with the value for the further needed argument (Relationship or Attribute) has been created.
A relationship between the abovementioned class and the classes involved in the symmetric n-ary relationship is created. |
| Elements | Class, Relationship, Attribute
Axioms: cardinality and equivalentClass |
| Implementation | |
| Reusable component | |
| Component type |
| Origin | Modelling distance between stages of St James Way during the Geobuddies ontology network development (http://geobuddies.dia.fi.upm.es). |
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| Known use | Geobuddies ontology network |
| Reference | |
| Related ODP | N-ary Relation: New Class (LP-NR -01) |
| Used in combination with | |
| Test |
No scenario is added to this Content OP.
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'Ontology Design Patterns'
