code: def find_ontology(self, txt):
          
          totFound = 0
          searchString = txt.upper()
          match = []
          if searchString != '':
              for i in self.lst_subj:
                  if searchString in i:
                      totFound = totFound + 1
                      match.append(i)
          if len(match) == 0:
              match.append('_TOP')
          return match
docs: top level function used for new data processing which attempts
          to find a level in a heirarchy and return the key and filename
          usage res = FindOntology('file')  # returns 'SYSTEM-PC-FILE'