  During the last two decades, we easilly see that the World Wide Web's link
structure is modeled as the directed graph. In this paper, we will model the
World Wide Web's link structure as the directed hypergraph. Moreover, we will
develop the PageRank algorithm for this directed hypergraph. Due to the lack of
the World Wide Web directed hypergraph datasets, we will apply the PageRank
algorithm to the metabolic network which is the directed hypergraph itself. The
experiments show that our novel PageRank algorithm is successfully applied to
this metabolic network.
