code: def get_analysis_type(self, instance):
          
          if IDuplicateAnalysis.providedBy(instance):
              return 'd'
          elif IReferenceAnalysis.providedBy(instance):
              return instance.getReferenceType()
          elif IRoutineAnalysis.providedBy(instance):
              return 'a'
          return None
docs: Returns the string used in slots to differentiate amongst analysis
          types