/// It encodes a `RDF dataset <https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-dataset>`_ and allows to query it using SPARQL.
///
/// :param path: the path of the directory in which Sled should read and write its data. If the directoty does not exist, it is created. If no directory is provided a temporary one is created and removed when the Python garbage collector removes the store.
/// :param path: the path of the directory in which Sled should read and write its data. If the directory does not exist, it is created. If no directory is provided a temporary one is created and removed when the Python garbage collector removes the store.
/// :type path: str or None
/// :raises IOError: if the target directory contains invalid data or could not be accessed
///
/// Warning: Sled is not stable yet and might break its storage format.
///
/// The :py:func:`str` function provides a serialization of the store data compatible with NTriples, Turtle and SPARQL:
/// The :py:func:`str` function provides a serialization of the store in NQuads: