Submissions:Summarization of an inverse n-ary relation
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|Motivation=The n-ary relationships should be used when: (a) a binary relationship really needs a further argument; (b) two binary relationships always go together and should be represented as one n-ary relation; (c) a relationship that is really amongst several things. | |Motivation=The n-ary relationships should be used when: (a) a binary relationship really needs a further argument; (b) two binary relationships always go together and should be represented as one n-ary relation; (c) a relationship that is really amongst several things. | ||
| - | + | On the one hand, the motivation of this pattern is to express the inverse relationship of an n-ary one where there are distinguished participants, that is, there is a single individual standing out as the subject or the "owner" of the relation. This means that the relationship exists mainly between two entities and the rest of entities involved in the relationship can be considered as additional arguments. | |
| + | |||
| + | On the other hand, this pattern is intended to speed up the queries involving the distinguished participants in the n-ary relationship. | ||
This pattern is inspired on the third consideration shown in http://www.w3.org/TR/swbp-n-aryRelations/#choosingPattern1or2. The difference in our case is that there are at least two distinguished participants into the relationship. Therefore this pattern could be considered as an extension of the third consideration shown in http://www.w3.org/TR/swbp-n-aryRelations/#choosingPattern1or2 applied to the use case of n-ary relationships described in http://www.w3.org/TR/swbp-n-aryRelations/#useCase1. | This pattern is inspired on the third consideration shown in http://www.w3.org/TR/swbp-n-aryRelations/#choosingPattern1or2. The difference in our case is that there are at least two distinguished participants into the relationship. Therefore this pattern could be considered as an extension of the third consideration shown in http://www.w3.org/TR/swbp-n-aryRelations/#choosingPattern1or2 applied to the use case of n-ary relationships described in http://www.w3.org/TR/swbp-n-aryRelations/#useCase1. | ||
Revision as of 16:18, 28 September 2010
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Graphical representation
Diagram
General information
| Name | Inverse n-ary relationship |
|---|---|
| Also known as | |
| Author(s) | MariaPoveda, MariCarmenSuarezFigueroa |
| SubmittedBy | MariaPoveda, MariCarmenSuarezFigueroa |
Description
| Motivation | The n-ary relationships should be used when: (a) a binary relationship really needs a further argument; (b) two binary relationships always go together and should be represented as one n-ary relation; (c) a relationship that is really amongst several things.
On the one hand, the motivation of this pattern is to express the inverse relationship of an n-ary one where there are distinguished participants, that is, there is a single individual standing out as the subject or the "owner" of the relation. This means that the relationship exists mainly between two entities and the rest of entities involved in the relationship can be considered as additional arguments. On the other hand, this pattern is intended to speed up the queries involving the distinguished participants in the n-ary relationship. This pattern is inspired on the third consideration shown in http://www.w3.org/TR/swbp-n-aryRelations/#choosingPattern1or2. The difference in our case is that there are at least two distinguished participants into the relationship. Therefore this pattern could be considered as an extension of the third consideration shown in http://www.w3.org/TR/swbp-n-aryRelations/#choosingPattern1or2 applied to the use case of n-ary relationships described in http://www.w3.org/TR/swbp-n-aryRelations/#useCase1. |
|---|---|
| Aim | The aim of this pattern is to allow asking for n-ary relationships and their inverse between two distinguished participants without a complex query (that would involve the class created to support the n-ary relation between the origin and destination classes of the n-ary relationship). |
| Solution description | |
| Elements | Class, Relationship, Attribute and inverseOf |
| Implementation | |
| Reusable component | |
| Component type |
Example
| Problem example | We might want to represent that a service provider provides a service at a place in a given period of time with a particular price. The model should also represent that a service is offered by a provider.
We have also observed that the queries executed by our applications often ask for the relationship between providers and their service and rarely ask for the relationships about the services and where they are provided.
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| Pattern solution example | |
| Consequences | The main advantage of this pattern is that allows asking for those services that are provided by a service provider and vice-versa without a complex query (that would involve the class created to support the n-ary relation between service providers and services). |
Pattern reference
| Origin | Logical Pattern for Modelling N-ary Relation: Introducing a New Class for the Relation (http://www.w3.org/TR/swbp-n-aryRelations/#pattern1) and the third consideration in http://www.w3.org/TR/swbp-n-aryRelations/#choosingPattern1or2 |
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| Known use | |
| Reference | |
| Related ODP | Logical Pattern for Modelling N-ary Relation: Introducing a New Class for the Relation |
| Used in combination with | Logical Pattern for Modelling N-ary Relation: Introducing a New Class for the Relation |
| Test |
Additional information
Scenarios
No scenario is added to this Content OP.
Reviews
| Review article | Posted on | About revision (current is 10161) |
|---|---|---|
| CatherineRoussey about Inverse n-ary relationship | 245545010 September 2010 | 1006010,060 |
| GerdGroener about Inverse n-ary relationship | 245545010 September 2010 | 1006010,060 |
| OlafNoppens about Inverse n-ary relationship | 245545616 September 2010 | 1010110,101 |
| AlessandroAdamou about Inverse n-ary relationship | 245545616 September 2010 | 1010110,101 |
This revision (revision ID 10161) takes in account the reviews: none
Other info at evaluation tab
Modeling issues
There is no Modeling issue related to this proposal.
References
| Submission to event |
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