docs: public static Element findCamundaExtensionElement(Element element, String extensionElementName) {
      Element extensionElements = element.element("extensionElements");
      if(extensionElements != null) {
        return extensionElements.elementNS(BpmnParse.CAMUNDA_BPMN_EXTENSIONS_NS, extensionElementName);
      } else {
        return null;
      }
    }