- Add a way to discover on which protocols Order-By applies
- Remove references to SQL (except in implementation notes)
- Specify that order-by operate on the whole item set and inside a RSM result set
- Explicitly says that creation and modification dates are set by Pubsub service itself
- Specify that Clark notation should be used for extensions
- Add a full example with Pubsub and RSM
- Add hint for SQL based implementations
- removed XEP-0060 and XEP-0313 as dependencies, they are mentioned as use cases, but are not mandatory
- better wording following feedback
- Namespace bump
