docs: def add_element(self, location, element, delete_elem=False):
          """
          Create an entry located at ``location``.
          
          Args:
              location: String or :class:`LocationDescriptor` to describe a "separator location" (i.e. dir1/dir2/dir3 for
                  instance).
              element: Element to store.
              delete_elem: Delete old element or not if it exist?
          
          Returns:
              The created node with the element.
              
          Notes:
              The different sub locations entries **must** exist and the last may or may not already exist.
              Use the more strict :meth:`add_unique_element` method if needed.
              
              You don't need to have a common root node. We internally use a dummy root node.
          """
          return self._create_entry(location, element, unique=False, delete_element=delete_elem)