jena

I'm having trouble expressing the following situation in my Ontology: Suppose I have four people voting and four votes (so there is a one-to-one mapping between vote and voter). People can either vote yes or no. If I know the outcome of three people's votes, I ought to be able to deduce the fourth person's vote. So to reiterate: John, Bob, Mary, and Carol each vote. Since there are four people there are four votes. The outcome of the vote is a tie (2 yes, and 2 no). Later on the reasoner determines that Bob and John voted no. The reasoner should then be able to deduce that Mary and Carol voted

I am trying to create a SPARQL query that performs the logarithm function on the returned results. I have implemented the Jena SPARQL engine in my java program, but have only been able to find these available functions : http://jena.sourceforge.net/ARQ/library-function.html Does anybody know of a way to take the logarithm (preferably the natural log) of a SPARQL return variable? Example query that works: SELECT DISTINCT ((?Transactions_Num) AS ?BusinessValue) WHERE {{?BusinessProcess relation:Transactions_Num ?Transactions_Num ;} } Example of query that I want to work (though currently does

I'm struggling with the execution of a SPARQL query in Jena, with a resulting behaviour that I don't understand... I'm trying to query the Esco ontology ( https://ec.europa.eu/esco/download ), and I'm using TDB to load the ontology and create the model (sorry if the terms I use are not accurate, I'm not very experienced). My goal is to find a job position uri in the ontology that matches with the text I have previously extracted: ex: extracted term : " acuponcteur " -> label in ontology: "Acuponcteur"@fr -> uri: < http://ec.europa.eu/esco/occupation/14918 > What I call the "weird behaviour" is