openEHR
Differential updates (e.g. when changing parts of compositions)
Some openEHR implementations (in addition to posting full "canonical" instances of RM objects) allow posting compact "diffs" that use an existing version of an object (e.g. a COMPOSITION) as a base and then just supply info on what has changed.
This issue/thread was created to discuss if/how that kind of functionality could be standardized.
One thing to consider is the desired behaviour when totally omitting an attribute in a diff call. In a canonical full form that means "no value", but in a diff format it might mean "no change". Deletion in a diff-format may require supplying the attribute and setting it's value to null.
(Issue added after discussion at meeting https://openehr.atlassian.net/wiki/display/spec/2016-06-30+REST+API+Meeting+notes)
