def add_element(self, location, element, delete_elem=False):
return self._create_entry(location, element, unique=False, delete_element=delete_elem)<EOL>
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.