posted 15 years ago
Hi William,
I think what it's trying to say is that a Queue has no knowledge of what is really inside it (apart from that it's a Message), it's further complicated by the fact that you could have an 'identical' message (in terms of business data) but with different Meta-data (e.g. Priority), so the concept of a message being 'equal' is difficult for implementors to provide.
Hope that made sense!