code: def addSourceLocation(self, sourceLocationUri, weight):
          
          assert isinstance(weight, (float, int)), "weight value has to be a positive or negative integer"
          self.topicPage["sourceLocations"].append({"uri": sourceLocationUri, "wgt": weight})
docs: add a list of relevant sources by identifying them by their geographic location
          @param sourceLocationUri: uri of the location where the sources should be geographically located
          @param weight: importance of the provided list of sources (typically in range 1 - 50)