public static LwRootContainer getRootContainer(final String formFileContent, final PropertiesProvider provider) throws Exception {
    if (!formFileContent.contains(FORM_NAMESPACE)) {
      throw new AlienFormFileException();
    }

    final Document document = new SAXBuilder().build(new StringReader(formFileContent), "UTF-8");

    return getRootContainerFromDocument(document, provider);
  }
public static LwRootContainer getRootContainer(final String formFileContent, final PropertiesProvider provider)