  We describe certain quiver Hopf algebras by parameters. This leads to the
classification of multiple Taft algebras as well as pointed Yetter-Drinfeld
modules and their corresponding Nichols algebras. In particular, when the
ground-field $k$ is the complex field and $G$ is a finite abelian group, we
classify quiver Hopf algebras over $G$, multiple Taft algebras over $G$ and
Nichols algebras in $^{kG}_{kG} {\cal YD}$. We show that the quantum enveloping
algebra of a complex semisimple Lie algebra is a quotient of a semi-path Hopf
algebra.
