Srw.dd=* does not work either:
Message: The index [srw.dd] did not include a searchable value
I suppose the only option left is to retrieve everything and filter the results on the client side.
Thanks for your quick reply.
From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of Mike Taylor
Sent: 16 May 2012 10:43
To: [log in to unmask]
Subject: Re: [CODE4LIB] WorldCat SRU queries - elimination of records without a DDC no from the result set
There is no standard way in CQL to express "field X is not empty".
Depending on implementations, NOT srw.dd="" might work (but evidently
doesn't in this case). Another possibility is srw.dd=*, but again
that may or may not work, and might be appallingly inefficient if it
does. NOT srw.dd=null will definitely not work: "null" is not a
special word in CQL.
On 16 May 2012 10:32, Arash.Joorabchi <[log in to unmask]> wrote:
> Hi all,
> I am sending SRU queries to the WorldCat in the following form:
> String host =
> String query = "sru?query=srw.kw=\"" + keyword + "\""
> + " AND srw.ln exact \"eng\""
> + " AND srw.mt all \"bks\""
> + " AND srw.nt=\"" + keyword + "\""
> + "&servicelevel=full"
> + "&maximumRecords=100"
> + "&sortKeys=relevance,,0"
> + "&wskey=[wskey]";
> And it is working fine, however I'd like to limit the results to those
> records that have a DDC number assigned to them, but I don't know what's
> the right way to specify this limit in the query.
> NOT srw.dd=""
> NOT srw.dd=null
> Neither of above work