def add_hyperedge(self, hyperedge):
if (not hyperedge in self.edge_links):<EOL><INDENT>self.edge_links[hyperedge] = []<EOL>self.graph.add_node((hyperedge,'<STR_LIT:h>'))<EOL><DEDENT>
Add given hyperedge to the hypergraph.

@attention: While hyperedge-nodes can be of any type, it's strongly recommended to use only
numbers and single-line strings as node identifiers if you intend to use write().

@type  hyperedge: hyperedge
@param hyperedge: Hyperedge identifier.