* @return The data being retrieved from the cache, never {@code null}.
     */
    T fromCache(T data);

    /**
     * The tag used to denote raw model data.
     */
    ModelCacheTag<ModelData> RAW = new ModelCacheTag<ModelData>() {

        @Override
        public String getName() {
            return "raw";
        }

        @Override
        public Class<ModelData> getType() {

        if (modelCache != null) {
            modelCache.put(groupId, artifactId, version, tag.getName(), tag.intoCache(data));
        }
    }

    private <T> T getCache(
            ModelCache modelCache, String groupId, String artifactId, String version, ModelCacheTag<T> tag) {
        if (modelCache != null) {