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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 > > -----Original Message----- > From: Code for Libraries [mailto:[log in to unmask]] On Behalf Of > Chad Benjamin Nelson > Sent: 15 May 2012 21:54 > To: [log in to unmask] > Subject: [CODE4LIB] Atlanta Digital Libraries meetup - May 23rd > > The first / next Atlanta Digital Libraries meetup is coming up soon: > > Wednesday, May 23rd 7pm > Manuel's Tavern<http://www.manuelstavern.com/location.php> > 602 N Highland Avenue Northeast > Atlanta, GA 30307 > North Avenue Room > > We have two scheduled talks, and are still looking others interested in > presenting. It's informal, so even if it is just a short topic you want > to get some feedback on, we'd love to hear it. > > So, come along if you are interested and in the area. > > > Chad > > > Chad Nelson > Web Services Programmer > University Library > Georgia State University > > e: [log in to unmask] > t: 404 413 2771 > My Calendar<http://bit.ly/qybPLJ> > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.2176 / Virus Database: 2425/5000 - Release Date: > 05/15/12 >