[Odrl-version2] The difference between offer and ticket

[fengwenjie]

Hello, all

I am a little confused about the definition of rights type 'offer' and 'ticket'. In the V2 Model, it says:

"Offer. The Offer entity supports rights expressions that are proposing content under various terms and conditions to any consuming party from the owner party. The Offer entity must contain an Asset entity, one or both Permission and Prohibition entities, and a Party entity with Assigner (rights holder) role. The Offer entity must not contain a Party entity with Assignee or Assignees (consumer/s) roles."

"Ticket. The Ticket entity supports rights expressions that are contracts stipulating the content, terms and conditions of usage, and the owning parties involved. The consuming party is not known at the time the ticket is issued and is redeemable by anyone who currently holds the ticket in their possession. The Ticket entity must contain an Asset entity, one or both Permission and Prohibition entities, and at least one Party entity with Assigner role. The Ticket entity must not contain a Party entity with Assignee or Assignees roles. "

from above, the only textual difference is that: ticket allows at least one party with Assigner role, while offer only allows exactly one! Then, what's the original intention to have these 2 kinds of rights types?  or to say, what's the semantic difference between them?

Thanks in advance,
Jessica
 
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