This module contains type aliases that should only be used when type checking
as it would otherwise introduce a runtime dependency on typing_extensions for
older python versions which is not desirable.
This was made mainly to accommodate sphinx-autodoc-typehints which cannot
recognize type aliases from imported files if the type aliases are defined
inside if TYPE_CHECKING:. So instead of placing the type aliases in normal
modules inside TYPE_CHECKING guards they are in this file which should only
be imported inside TYPE_CHECKING guards.
Internal use only
Things inside this module are not for use outside of RDFLib and this module is not part the the RDFLib public API.