code: def iscm_md_append_array(self, arraypath, member):
          
          array_path = string.split(arraypath, ".")
          array_key = array_path.pop()
          current = self.metadata
          for k in array_path:
              if not current.has_key(k):
                  current[k] = {}
              current = current[k]
          if not current.has_key(array_key):
              current[array_key] = []
          if not type(current[array_key]) == list:
              raise KeyError("%s doesn't point to an array" % arraypath)
          current[array_key].append(member)
docs: Append a member to a metadata array entry