Geoff can live with either relative or absolute. Must distinguish between a list of segments and a list of bindings. If you associate the same segment with a different resource, you've changed the state of the collection. Make sure people know the state is a set of bindings, not a set of segments. There aren't any free-floating bindings.
All bindings are part of the state of some collection.
Consistency with RFC 2518 would mean we say that collection members are URIs. Add a paragraph on how bindings are related to collection members. Keep definitions basically as they are. Just talk about how they are related to RFC 2518. Probably no one else thought about it.