docs: public void parseDiagramInterchangeElements() {
      // Multiple BPMNDiagram possible
      List<Element> diagrams = rootElement.elementsNS(BPMN_DI_NS, "BPMNDiagram");
      if (!diagrams.isEmpty()) {
        for (Element diagramElement : diagrams) {
          parseBPMNDiagram(diagramElement);
        }
      }
    }