@Override
    public void writeTo(Output output, T message) throws IOException
    {
        schema.writeTo(output, message);
    }
A schema (helper class) that wraps another schema and allows its subclasses to override certain methods for more
customization.

@author David Yu
@created May 28, 2010
protostuff-api/src/main/java/io/protostuff/CustomSchema.java