def addDataSet(self, setId):
if (setId in self.dataSetIds): return (self.dataSetIds[setId])
domain = self.session.getDomain(self.observationDomainId)
dataSet = Set.createDataSet(domain, setId)
self.dataSets.append(dataSet)
self.allSets.append(dataSet)
self.dataSetIds[setId] = dataSet
return (dataSet)
