. "August, 2011"@en . "RECommendations Ontology"@en . "The RECO ontology defines the vocabulary for representing prefereces-as-constraints and preferences-as-ratings as RDF graphs. This lightweight vocabulary provides domain-independent means to describe user profiles in a coherent and context-aware way. RECO has been designed as an extension of both Friend-Of-A-Friend (FOAF) and Who Am I! (WAI) ontologies."@en . "Copyright by Fundaci\u00F3n CTIC" . "Diego Berrueta (Fundaci\u00F3n CTIC)" . "Carlos Ruiz (iSOCO S.A.)" . "Emilio Rubiera (Fundaci\u00F3n CTIC)" . "Luis Polo (Fundaci\u00F3n CTIC)" . "Iv\u00E1n M\u00EDnguez (Fundaci\u00F3n CTIC)" . . . . . "Excluded Preference"@en . "This property relates a demand with a particular preference P. The items that fulfill the constraints of P are excluded from the set of results calculated for this demand."@en . . . . . "Filter"@en . "A property that relates a pattern with a constraint of the value of a datatype property. For instance, \"less than 180 cms height\" or \"released before 1980\"."@en . . . . . "Operator"@en . "A property that relates a filter to the operator restraining the value of a datatype property."@en . . . . "Optional Preference"@en . "This property relates a demand to a preference P. The items that fulfill the constraints of P increase or decline their utility value according to the utility of P."@en . . . . . "Preference"@en . "This property relates a demand with the set of preferences that defines its matchmaking conditions. "@en . . . . "Required Preference"@en . "This property relates a demand with a preference P. The items fulfilling the constraints of P must be included in the final set of results for this demand."@en . . . . . "Union composition"@en . "A property which reifies a disjunction of constraints."@en . . . . . "About"@en . "A property that relates a preference with its main pattern."@en . . . . "Assigned by"@en . "This property relates a rating with the person having carried out it."@en . . _:genid1 . _:genid2 . _:genid3 . _:genid2 _:genid3 . _:genid4 . _:genid3 _:genid4 . _:genid5 . _:genid4 _:genid5 . _:genid5 . _:genid1 _:genid2 . _:genid1 . . "Holds"@en . "This property relates a person with a preference."@en . . _:genid6 . _:genid7 . _:genid8 . _:genid7 _:genid8 . _:genid9 . _:genid8 _:genid9 . _:genid10 . _:genid9 _:genid10 . _:genid10 . _:genid6 _:genid7 . _:genid6 . . "Rates"@en . "This property relates a rating with the resource assessed. Notice that this property has an open range (rdfs:Resource), therefore ratings can be applied to anything, including preferences themselves."@en . . . "Utility"@en . "This property captures the utility value of a rating. The utility in RECO is measured in the real interval [-1,1]. In practice, other discrete scales can be also used to measure users' opinions on resources, such as the Likert scale. "@en . . . . "Demand"@en . . "Groups of preferences representing users' requests at a given context or situation."@en . . "Filter"@en . "A datatype constraint based on boolean operators."@en . . "Operator"@en . "Boolean operations on data values: string comparisons, numerical intervales and (in)equality. Operators are reused from the X-path specification to ensure interoperability."@en . . "Pattern"@en . "Patterns are reifications of constraints, which are conditions about the desired or preferred attributes of the resources. A constraint ranges over a set of individuals. RECO considers several kind of constraint expressions: (1) conjunction of constraints: \"music from the sixties\"; (2) disjunction of constraints: \"music or films\"; (3) composition of constraints: \"cars with powerful engines\"; (4) datatype constraints based on boolean operators: \"released before 1980\"."@en . . "Preference"@en . . "A preference is a qualitative description of the desired attributes that resources must ideally satisfy in order to be of interest for a user. A preference is described by a set of constraints."@en . . "Rating"@en . "A rating is a quantitative measurement of the \"appealingness\" of a particular item to a user."@en .