* User properties
     */
    @Nonnull
    Map<String, String> getUserProperties();

    @Nonnull
    ModelResolver getModelResolver();

    @Nonnull
    ModelRepositoryHolder getModelRepositoryHolder();

    @Nullable
    ModelCache getModelCache();

    @Nullable
    Object getListener();

    @Nullable
    ModelBuilderResult getInterimResult();

    @Nullable