All titles of graphs and nodes have to be unique.
A node can only have two near edges. If more than two near edges are specified for a node, the remaining near edges are converted into normal edges.
A node with anchored edges can only have one near edge at maximum. Further, if anchored edges occur, the orientation is always top_to_bottom.
The level of nodes (also of summary nodes) is not recognized unless the whole graph is drawn automatically, menaing unless at least one node has no specified location. Normally, all level 0 nodes form the uppermost layer, with nodes of other levels forming the next layer underneath. The level specification may conflict with a near edge specification, because the source and target node of a near edge have to have the same level. In this case, the level specification of the source or target node of the near edge is ignored.