docs: protected final Property parseVendorExtension( String vendorExtension ) {
          if (vendorExtension == null) return null;
          // Remove the curly braces ...
          String extension = vendorExtension.replaceFirst("^[{]", "").replaceAll("[}]$", "");
          if (extension.trim().length() == 0) return null;
          return parseVendorExtensionContent(extension);
      }