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GraphicallyRepresentedBy This pattern allows representing symmetric … 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 and y, then: SNAry(x,y)=z iff SNAry(y,x)=z MariaPoveda  +, MariCarmenSuarezFigueroa  + The main advantage of this pattern is that allows representing distance between places without including redundancy in the ontology. A class to represent the n-ary relationshi … 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. e symmetric n-ary relationship is created. Class, Relationship, Attribute Axioms: cardinality and equivalentClass Geobuddies ontology network The symmetric n-ary relationship pattern e … 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. , resulting in a redundant representation. Symmetric n-ary relationship  + Modelling distance between stages of St James Way during the Geobuddies ontology network development (http://geobuddies.dia.fi.upm.es). For example, we might want to represent the distance expressed in kilometres between two places. 16 September 2010 12:54:56  + , , , ,

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