[Yazlist] zoom client and estimated result set size

Mike Taylor mike at indexdata.com
Thu Mar 27 21:30:33 UTC 2014


That's fine for SRU, but the question was about Z39.50. I've still
never seen a Z39.50 specification for this -- only the YAZ
implementation. I have no idea what that was based on.

-- Mike.



On 27 March 2014 19:58, Ray Denenberg <rden at loc.gov> wrote:
> 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 3.2.2.1.11
>
>> 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
>
>> version.
>
>
>
> Actually this was introduced in SRU 2.0:
>
>
>
> 7.6 resultCountPrecision
>
> The response element<resultCountPrecision> allows the server to indicate or
> estimate the accuracy of the result count as reported by <numberOfRecords>.
> .......
>
> ·         exact
>
> o    The server guarantees that the value as reported in <numberOfRecords>
> is accurate.
>
> ·         unknown
>
> o    The server has no idea what the result count is, and does not want to
> venture an estimate.
>
> ·         estimate
>
> o     The server does not know the result set count, but offers an estimate.
>
> ·         maximum
>
> o    The value supplied is an estimate of the maximum possible count that
> the result set will attain.
>
> ·         minimum
>
> o    The server does not know the result count but guarantees that it is at
> least this large.
>
> ·         current
>
> 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.
>
>
>
>
>
>
>
>
> _______________________________________________
> Yazlist mailing list
> Yazlist at lists.indexdata.dk
> http://lists.indexdata.dk/cgi-bin/mailman/listinfo/yazlist
>



More information about the Yazlist mailing list