  An asymptotically exact partition function of the multi-channel
resonant-level model is obtained through Tomonaga-Luttinger bosonization. A
Fermi-liquid vs non-Fermi-liquid transition, resulting from a competition
between the Kondo and X-ray edge physics, is elucidated explicitly via the
renormalization group theory. In the strong-coupling limit, the model is
renormalized to the Toulouse limit.
