docs: public Set<Body> getBodies() {
          List<ExtensionElement> bodiesList = getExtensions(Body.ELEMENT, Body.NAMESPACE);
          Set<Body> resultSet = new HashSet<>(bodiesList.size());
          for (ExtensionElement extensionElement : bodiesList) {
              Body body = (Body) extensionElement;
              resultSet.add(body);
          }
          return resultSet;
      }