Hi,
I am not sure whether the following description in this draft is enough for the
usage of Entity-tags with filtering.
"5.1. Generating Entity-tags
The views might correspond to different groups of users that have
varying levels of access rights to the resource state, or to
subscribers that have modified their subscription using event
notification filtering [11]."
My consideration is:
If a subscriber has a subscription with filter F1, the current corresponding
entity-tag is E1. Then the same subscriber MUST NOT send SUBSCRIBE with a new
filter F2 and the entity-tag E1 in the conditional header field.
i.e., if a subscriber changes filter for an event state, the
Suppress-XXX-If-Match should not be used.
The client of subscriber has to record the last filter for event state and
compare filters.
Cheers,
Qian
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