Binding file with only includes should be possible; enables modular design

I have a mapping file per Domain Object. I want to include these
files in an overall jibx binding file, like this:
<binding>
<include path="Customer.xml"/>
<include path="Order.xml"/>
<include path="Product.xml"/>
</binding>

This doesn't work because a mapping element is expected. When I add
one mapping to my overall jibx binding file everything works fine. Do you think the
option of only having includes without a mapping element is a valid option and should be implemented
as a new feature?