I guess Fedora 4 is not sending the `Link: http://www.w3.org/ns/ldp#Resource; rel="type"` header? 

In any case, we should check all of these options:
http://www.w3.org/ns/ldp#Resource 
http://www.w3.org/ns/ldp#BasicContainer - for LDP Basic Containers
http://www.w3.org/ns/ldp#DirectContainer - for LDP Direct Containers
http://www.w3.org/ns/ldp#IndirectContainer - for LDP Indirect Containers