def get_comment_smart_book_session(self, book_id=None, proxy=None):
if proxy is None:<EOL><INDENT>raise NullArgument()<EOL><DEDENT>raise Unimplemented()<EOL>
Gets the session for managing dynamic comment books for the given book.

        arg:    book_id (osid.id.Id): the ``Id`` of a book
        arg:    proxy (osid.proxy.Proxy): a proxy
        return: (osid.commenting.CommentSmartBookSession) - ``book_id``
                not found
        raise:  NotFound - ``book_id`` or ``proxy`` is ``null``
        raise:  NullArgument - ``book_id`` or ``proxy`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_comment_smart_book()`` is
                ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_comment_smart_book()`` is ``true``.*