"The model bound to PREFIX becomes the default model.\n" +
"This means that the tasks contained in this model may\n" +
"be used in commands such as 'run' without specifying a\n" +
"prefix.")
public void _model(String prefix) {
TaskModel model = getModelSet().getModelForPrefix(prefix);
if (model == null)
throw new IllegalArgumentException("unknown model: " + prefix);
getModelSet().setDefaultPrefix(prefix);
out.printf("Using %s=%s\n", prefix, model.getURI());
}