code: public FacesConfigNavigationCaseType<FacesConfigNavigationRuleType<T>> getOrCreateNavigationCase()
     {
        List<Node> nodeList = childNode.get("navigation-case");
        if (nodeList != null &&  nodeList.size() > 0)
        {
           return new FacesConfigNavigationCaseTypeImpl<FacesConfigNavigationRuleType<T>>(this, "navigation-case", childNode, nodeList.get(0));
        }
        return createNavigationCase();
     }
docs: If not already created, a new <code>navigation-case</code> element will be created and returned.
  Otherwise, the first existing <code>navigation-case</code> element will be returned.
  @return the instance defined for the element <code>navigation-case</code>