code: def load(self):
          
          self._readSystemTable()
          self._readOntologyTable()
          self._readReferenceSetTable()
          self._readReferenceTable()
          self._readDatasetTable()
          self._readReadGroupSetTable()
          self._readReadGroupTable()
          self._readVariantSetTable()
          self._readCallSetTable()
          self._readVariantAnnotationSetTable()
          self._readFeatureSetTable()
          self._readContinuousSetTable()
          self._readBiosampleTable()
          self._readIndividualTable()
          self._readPhenotypeAssociationSetTable()
          self._readRnaQuantificationSetTable()
docs: Loads this data repository into memory.