Assertion: z push | /r/CapableOf | read message changes
Facets:
value: from a 'diff' source
type: OTHER
value: directly
type: MANNER
Source sentences:
text: When a backend supports it, Z-Push can also make use of advanced features which bring server load down even lower, for example reading message changes directly from a 'diff' source, instead of comparing all the messages with whatever was in there last time.