AssetSource source = newAssetSource();
Environment env = newEnvironment();
Asset asset = newAsset();
Locale l = Locale.FRENCH;
d.newRootElement("html").element("head");
train_peek(env, Document.class, d);
train_getLocale(tl, l);
train_getClasspathAsset(source, "org/apache/tapestry/default.css", l, asset);