[Koha-zebra] Incomplete CQL Support in Net-Z3950-ZOOM

[Thomas D]

Thank you Mike,

There was much rejoicing in the land.

applause

(you may take a bow)

Have a few days rest before I ask my next question, after which I hope there
will be even greater rejoicing.


Thomas D


Quoting Mike Taylor <mike at miketaylor.org.uk> :
> ---------------- Beginning of the original message ------------------
> 
> > Date: Fri, 16 Dec 2005 15:05:01 +0100
> > From: Thomas D <koha at alinto.com>
> >
> > I have found some issues with Net-Z3950-ZOOM for the use of
> CQL, as
> > the underlying query syntax for Koha in 3.0 and beyond.
> 
> Hi, Thomas, thanks for your comments.
> 
> > "scan()"
> > ...
> > "All of this is done by using a single term from the PQF
> query as
> > the scan() argument. (At present, only PQF is supported,
> although
> > there is no reason in principle why CQL and other query
> syntaxes
> > should not be supported in future)."
> > 
> > Scan has many potential very important applications for
> guiding user
> > queries based on the contents of the record instead of
> requiring the
> > user to do more guessing for what query terms may be
> actually
> > present in the index for the database of records.
> 
> I agree.  I have added support for CQL scanning to ZOOM-Perl
> (and
> therefore to the underlying ZOOM-C).  It's tested, working and
> checked
> into CVS, and should be released some time in the next few
> days.  So
> now you can say:
> 
> 	($ss, $n) = $conn->scan(new
> ZOOM::Query::CQL('dc.title=dinosaur');
> 
> (You may applaud.)
> 
> > "sortby()"
> > ...
> > "It ought to be possible to sort by CQL query, too, but at
> present
> > limitations in the underlying ZOOM-C library make this
> impossible."
> 
> Yeah, I was talking complete cheese there, sorry.  Sort
> specification
> in ZOOM-C (and therefore ZOOM-Perl) are in a completely
> separate
> language that has nothing to do with either CQL or RPN.  The
> comment
> in the documentation is meaningless.  (It'll be fixed in
> v1.01.)
> 
> > Is the lack of sortby() support for CQL merely a significant
> > inconvenience rather than something that would absolutely
> prevent
> > the use of CQL when sorting records by some element is
> needed?
> 
> I see the the documentation is unclear as well as incorrect
> :-)  
> There is no problem at all with using CQL to search and then
> sorting
> the result.  What I was lamenting was that CQL can't be used
> to
> specify the sort criteria themselves.  Well, duh!  Neither can
> FORTRAN
> or Serbo-Croat.  That's because none of them are
> sort-specification
> languages.
> 
> So there is no problem here.
> 
> In the medium term, plans are afoot to extend the CQL
> specification
> with syntax for sorting like this:
> 	dc.author=Adams sortby dc.date dc.title
> Once this is agreed, ZOOM-C will no doubt implement it, and
> therefore
> so will ZOOM-Perl.  "Great things are afoot."
> 
> > It would be a shame if these issues mitigated against using
> CQL, the
> > otherwise best tool for the job.
> 
> Agreed.
> 
>  _/|_	
> ___________________________________________________________________
> /o ) \/  Mike Taylor  <mike at miketaylor.org.uk> 
> http://www.miketaylor.org.uk
> )_v__/\  "Connery doesn't act anymore, he just plays Sean
> Connery" --
> 	 Richard Sherbaniuk.
> 
> 
> ------------------- End of the original message ---------------------




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