- From: Heiko Jansen <jansen@hbz-nrw.de>
- Date: Thu, 16 Sep 2004 18:36:01 +0200
- To: www-zig@w3.org
Am Mittwoch, 15. September 2004 20:29 schrieb Slavko Manojlovich <slavko@mun.ca> [RE: Z39.50 Searching]: > I thought that structure = wordlist was deprecated because it supported > default behaviour vis a vis the application operators on the server side. > Some servers default to "AND" and other servers default to "SAME FIELD". > Ideally, you would send this search as structure = 2 with the "AND" > operator. Seems to be bad luck for me: I was hoping I could tell the server implementors to change their serversī behaviour, but if there is no exact definition of how a server should react to such queries my negotiating position seems quite weak. > Quoting "LeVan,Ralph" <levan@oclc.org>: > > It's not obvious to me why you get these different results. Neither to me ;-) In my opinion the "word list" query should yield all hits as there is attr 3=3 (Position = any pos. in field) which IMHO should apply to all words of the word list separately. And there should be no hidden logic about differrent fields beneath the index and the occurence of all words in one of these. But after all thatīs just an opinion.... > > An experiment would be to repeat the search, omitting attribute types 2, > > 3 and 5, since they were also omitted from the ANDed search. That still gives me no hits. > > If you still get different results, I'd contact the database provider. I contacted one of the developers of that system and he told me their system would conform to the standard because it assumes that searching with a word list implies "all words from one field/subfield" (regardles of the value of the Structure attrib in the query). If Slavko is right, thatīs not entirely true but then neither is my opinion. Iīm still wondering, however, what is really meant by the terms "field"/"subfield"? Since Z39.50 provides an abstraction layer for searching and the record syntaxes are decoupled from the search indices: how am I supposed to find out what fields and subfields there are? Could anyone provide me with a definition of these terms or point me to a discussion of this topic? Still wondering Heiko -- ________________________________________________ Dipl.-Bibl. Heiko Jansen Hochschulbibliothekszentrum NRW (HBZ) Postfach 27 04 51, 50510 Koeln, Deutschland Telefon +49-221-40075-150, Fax +49-221-40075-190 Juelicher Str. 6, 50674 Koeln, Deutschland jansen@hbz-nrw.de GPG Fingerprint: F65F BA22 2833 C196 440B B766 2BD1 41D5 13D4 6609
Received on Thursday, 16 September 2004 16:37:01 UTC