What does ? ? ? mean in the octet diagrams in the HPACK rfc7541

I am confused by the question marks in the diagrams for the integer compressionn in HPACK. Does this mean we ignore the values of the bits, or are they set by another process — reserved for something else?

Please advise,

Hadil G. Sabbagh, Ph. D.

Received on Saturday, 29 July 2017 00:20:00 UTC