PREFIX regionState: <http://www.daml.ri.cmu.edu/ont/USRegionState.daml#>
PREFIX city: <http://www.daml.ri.cmu.edu/ont/USCity.daml#>

SELECT ?name ?cityName
FROM <http://www.daml.ri.cmu.edu/ont/USRegionState.daml>
FROM <http://www.daml.ri.cmu.edu/ont/USCity.daml>

WHERE 
{ ?state regionState:name ?name.
  ?state regionState:capital ?capital.
  ?capital city:name ?cityName.
}