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Hi mark, Srw.dd=* does not work either: Identifier: info:srw/diagnostic/1/27 Meaning: Details: srw.dd 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. Arash -----Original Message----- 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. -- Mike. 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 = > "http://worldcat.org/webservices/catalog/search/"; > 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 > > > Thanks, > Arash >