that may be true sometimes (or even often) but sending Classic Z3950
searches to multiple servers does work - for instance if a bunch of
servers support the same profile (like Bath) then the searches can be sent
unchanged - or even without a common profile if there is some common
subset of the attributes the servers support and the client only sends
those (or the server ignores the additional ones it doesnt know how to
On Wed, 13 Feb 2002, LeVan,Ralph wrote:
> Sorry, but I don't see a mechanism where this can happen. SRW searches
> can't be sent, unchanged, to multiple servers for exactly the same reasons
> that it doesn't work in classic Z39.50. Different servers provide different
> access points to their data. In classic Z39.50, that means different
> attribute combinations. In SRW, that means different indexes.
> > -----Original Message-----
> > From: Ray Denenberg [mailto:[log in to unmask]]
> > Sent: Wednesday, February 13, 2002 12:01 PM
> > To: [log in to unmask]
> > Subject: Re: CQL - what do people want?
> > "LeVan,Ralph" wrote:
> > > > Do people want to be able to take one query and issue it against
> > > > multiple collections without change?
> > >
> > > I don't think so. All our queries are explicitly against a
> > single database.
> > Ralph, I think your response is a bit terse and oblique.
> > Alan's question merits
> > careful consideration, if I understand it. SRW queries are
> > against a single
> > database, but I'm not sure what's the relevance of that to
> > the question. Z39.50
> > queries are against a single server (as opposed to a single
> > database) but Z39.50
> > has tried to evolve into a protocol that supports distributed
> > searching. One
> > reason that it hasn't had as much success as we'd hoped is
> > that queries have to
> > be tailored; they can't in general be issued to multiple
> > servers without
> > change. The question Alan is asking is, how important will
> > that property be for
> > cql. So, Ralph, are you saying that the ability to develop
> > applications that do
> > distributed searching based on CQL isn't important?
> > --Ray