RelateNode

Add the edge to the list of edges at this node

Tests whether any incident edge is flagged as being in the result. This test can be used to determine if the node is in the result, since if any incident edge is in the result, the node must be in the result as well.

return <code>true</code> if any incident edge in the in the result

To merge labels for two nodes, the merged location for each LabelElement is computed. The location for the corresponding node LabelElement is set to the result, as long as the location is non-null.

Updates the label of a node to BOUNDARY, obeying the mod-2 boundaryDetermination rule.

Update the IM with the contribution for this component. A component only contributes if it has a labelling for both parent geometries