SPARQL Queries equivalent to the competency questions of Exercice 2 
===================================================================

 1. SELECT ?instrument
    WHERE {
      :flea :plays ?instrument .
    }

 2. SELECT ?member
    WHERE {
      ?membership :hasBand :red_hot_chili_peppers .
      ?membership :hasTimePeriod :time_period_2 .      
      ?membership :hasMember ?member .
    }

 3. SELECT ?role
    WHERE {
      ?rolemembership :hasBand :red_hot_chili_peppers .
      ?rolemembership :hasTimePeriod :time_period_2 .      
      ?rolemembership :hasMember :antony_kiedis .
      ?rolemembership :hasRole ?role .      
    }

 4. SELECT ?timeperiod
    WHERE {
      :stadium_arcadium :recordedDuring ?timeperiod . 
    }

 5. SELECT ?count
    WHERE {
      :stadium_arcadium :hasTracks ?count .
    }
    
    NOTE: the following query returns the correct answer only if all the tracks 
          of an album are actually entered into the ontology
          
          SELECT COUNT(?track) COUNT ?count
          WHERE {
            :stadium_arcadium :hasTrack ?track .
          }

 6. SELECT ?timeperiod
    WHERE {
      :stadium_arcadium :releasedOn ?timeperiod . 
    }

 7. SELECT ?song
    WHERE {
      :stadium_arcadium_hump_de_bump :isRecordingOf ?song .
    }

 8. SELECT ?timeperiod
    WHERE {
      :hump_de_bump :composedOn ?timeperiod .
    }

 9. SELECT ?text
    WHERE {
      ?criticmembership :criticMembershipHasPerson :crian_hiatt .
      ?criticmembership :criticMembershipHasAlbum :stadium_arcadium .
      ?criticmembership :criticMembershipHasCritic ?critic .      
      ?critic rdfs:label ?text .
    }

10. SELECT ?timeperiod
    WHERE {
      :performance_1 :performanceHasTimePeriod ?timeperiod .
    }

11. SELECT ?song
    WHERE {
      :performance_1 :performanceHasSong ?song .
    }

12. SELECT ?place
    WHERE {
      :performance_1 :performanceHasPlace ?place .
    }

13. SELECT ?regionname
    WHERE {
      :portland :isCityOf ?region .
      ?region rdfs:label ?regionname .
    }

14. SELECT ?countryname
    WHERE {
      :oregon :isRegionOf ?country .
      ?country rdfs:label ?countryname .
    }