Submissions:Symmetric n-ary relationship
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General information
| Name | Symmetric n-ary relationship |
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| Also known as | |
| Author(s) | MariaPoveda, MariCarmenSuarezFigueroa |
| SubmittedBy | MariaPoveda, MariCarmenSuarezFigueroa |
Description
| 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 places needs a further argument to represent the distance. 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. Moreover, 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. |
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| 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 | Create a class to represent the n-ary relationship which will contain the value for the further needed argument (Relationship or Attribute). Create a relationship between this class and the classes involved in the symmetric n-ary relationship. |
| Elements | Class, Relationship, Attribute
Axioms: cardinality and equivalentClass |
| Implementation | |
| Reusable component | |
| Component type |
Example
| Problem example | For example, we might want to represent the distance expressed in kilometres between two places. |
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| Pattern solution example | 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 being redundant. |
Pattern reference
| 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 |
Additional information
Scenarios
Scenarios about Symmetric n-ary relationship
No scenario is added to this Content OP.
Reviews
Reviews about Symmetric n-ary relationship
| Review article | Posted on | About revision (current is 9953) |
|---|---|---|
| OlafNoppens about Symmetric n-ary relationship | 245545616 September 2010 | 1006610,066 |
| RimDJEDIDI about Symmetric n-ary relationship | 245545616 September 2010 | 1010610,106 |
| AlessandroAdamou about Symmetric n-ary relationship | 245545616 September 2010 | 1010610,106 |
This revision (revision ID 9953) takes in account the reviews: none
Other info at evaluation tab
Modeling issues
Modeling issues about Symmetric n-ary relationship
There is no Modeling issue related to this proposal.
References
| Submission to event |
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