code: public void addConnection(String nodeType, int fromOrdinal, String viaProperty, int toOrdinal) {
          addConnection(CONNECTION_MODEL_GLOBAL, nodeType, fromOrdinal, viaProperty, toOrdinal);
      }
docs: Add a connection to this graph.  The connection will be from the node identified by the given <code>nodeType</code> and <code>fromOrdinal</code>.
  The connection will be via the specified <code>viaProperty</code> in the {@link NFNodeSpec} for the given <code>nodeType</code>.
  The connection will be to the node identified by the given <code>toOrdinal</code>.  The type of the to node is implied by the <code>viaProperty</code>.