Nodes Section

The first line contains n, the number of nodes in the graph. The nodes are ordered and numbered according to their position in the node list of the graph. Each of the following n lines contains the information which is associated with the respective node of the graph. When the information of a node (or an edge) is sent to an output stream, it is always enclosed by the strings |{ and }|. If the graph is not parameterized, then the string between these parantheses is empty, so that all the n lines contain the string |{}|.