@utilities.arguments_not_none<EOL><INDENT>def assign_comment_to_book(self, comment_id, book_id):<DEDENT>
<EOL>mgr = self._get_provider_manager('<STR_LIT>', local=True)<EOL>lookup_session = mgr.get_book_lookup_session(proxy=self._proxy)<EOL>lookup_session.get_book(book_id)  <EOL>self._assign_object_to_catalog(comment_id, book_id)<EOL>
Adds an existing ``Comment`` to a ``Book``.

        arg:    comment_id (osid.id.Id): the ``Id`` of the ``Comment``
        arg:    book_id (osid.id.Id): the ``Id`` of the ``Book``
        raise:  AlreadyExists - ``comment_id`` is already assigned to
                ``book_id``
        raise:  NotFound - ``comment_id`` or ``book_id`` not found
        raise:  NullArgument - ``comment_id`` or ``book_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*