[Yazlist] zoom client and estimated result set size
rden at loc.gov
Thu Mar 27 19:58:41 UTC 2014
From: Mike Taylor
> I checked the more recent Z39.50-2003 version at
http://www.loc.gov/z3950/agency/Z39-50-2003.pdf but section 22.214.171.124.11
> lists the same Result-set-status values as the 2005 version. I can find
> nothing in either version of the standard that suggests there's any
> facility for reporting estimates. It's possible that it's in one of the
> many Implementor Agreements, Amendments, etc. listed at
http://www.loc.gov/z3950/agency/related95.html but I can't find it from
> a brief scan, and they were all supposed to be integrated into the 2003
Actually this was introduced in SRU 2.0:
The response element<resultCountPrecision> allows the server to indicate or
estimate the accuracy of the result count as reported by <numberOfRecords>.
o The server guarantees that the value as reported in <numberOfRecords>
o The server has no idea what the result count is, and does not want to
venture an estimate.
o The server does not know the result set count, but offers an estimate.
o The value supplied is an estimate of the maximum possible count that
the result set will attain.
o The server does not know the result count but guarantees that it is at
least this large.
o The value supplied is an estimate of the count at the time the
response was sent, however the result set may continue to grow.
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