[AtomPub] a collection is a representation of members, and thus contains a list of entries representing each individual member. according to the atom model, each entry MUST have an , which is a URI but has no interaction semantics (specifically, best practice suggests that minting URIs that are not actionable might be a good idea). entries may have embedded content, or may link to the content they are representing. identity is established by the entry , and this is particularly important in scenarios where collections may be aggregated and filtered and repurposed: entry identity must always be visible in the , and thus identity can be tracked across paths where entries may get repurposed in various collections. [Model Aspect] 
member identity