return new UriTextResource(description, source, resolver);
    }

    private boolean isCacheable(URI source) {
        return isCacheableScheme(source) && isCacheableResource(source);
    }

    /**
     * Is {@code source} a cacheable transport scheme (e.g., http)?
     *
     * Schemes like file:// are not cacheable.
     */
    private boolean isCacheableScheme(URI source) {