assert elements != null;
LOG.debug("{}の結線に関する正当性を確認しています", graph);
boolean sawError = false;
for (FlowElement element : elements.getNodeSet()) {
Connectivity connectivity = element.getAttribute(Connectivity.class);
if (connectivity == null) {
connectivity = Connectivity.getDefault();
}
for (FlowElementInput port : element.getInputPorts()) {
if (port.getConnected().isEmpty() == false) {