Hello Aldo, I really like this idea. Say, when search for standard, first search in more important international documents, then common national, then specific for the specific application, then local recs. That sounds nice. Unfortunately, there's no appropriate SQL infrastructure, hence no chance for quick implementation. The only extension we have for UNION is so-called BEST EFFORT UNION that lets gather data from multiple unreliable remote sources without halt on error if some sources are temporarily unavailable --- the result is formed from data returned by live instances.
Anyway I'll bugzilla this idea as an enhancement request to myself, to not forget. Best Regards, Ivan. On Fri, 2009-07-10 at 16:08 -0400, Aldo Bucchi wrote: > Hello, > > Is it possible to indicate an order of preference for a set of > alternative matches ( unions )? > We have found that explicit order is not respected when querying LOD ( > however, it does work against Virtuoso 5 ). > Is this a Virtuoso cluster/anytime introduced behaviour or is this how > SPARQL is supposed to behave? > I have been trying to find some literature on this. I am 90% sure I > once relied on the order of the UNION patterns for something similar. > But I might be very mistaken. > > Thanks, > A
