- From: Steve Harris <steve.harris@garlik.com>
- Date: Wed, 29 Aug 2012 10:08:12 +0100
- To: Andy Seaborne <andy.seaborne@epimorphics.com>
- Cc: public-rdf-wg@w3.org
On 2012-08-28, at 17:55, Andy Seaborne wrote: > On 28/08/12 16:49, Steve Harris wrote: >>> If you don't have a syntax or protocol (such as an RDF API) for constructing graphs with shared bnodes, then, yes, you need to indicate that some kind of unification is desired/appropriate. >>> > >>> >It seems to me the simple. obvious, and appropriate way to handle this for most use cases is to allow blank node labels to be shared between different parts of a multi-graph document. >> It's very easy in the case where you want to indicate that the bNodes are shared - but there is some cost to it - when you want to produce the multi-graph document you need to ensure that the labels for distinct bNodes are kept distinct. >> >> Consequently you can't do tricks like: >> >> ( for i in *.ttl; do echo "<$i> {" ; cat $i ; echo "}" ; done ) > foo.trig >> >> I've never done anything exactly like that, and I have no feel for >> how common a usecase it is, but it's worth noting that in RDF-2004 it would >> be "safe", and in RDF 1.1 it might result in shared bNodes, depending on >> how lucky you were. > > @prefixes ? Sure, you'd need to do something tricksier if your data used a fuller range of Turtle syntax, you could add some grep and grep -v into the mix but I'm not going to advocate that people parse Turtle with text processing tools. Perhaps ( for i in *.nt; do echo "<$i> {" ; cat $i ; echo "}" ; done ) > foo.trig would be a better example? Historically (and currently) what did/does Jena do with bNode labels shared between graphs in Trig? Have users ever commented one way or the other? I can't remember anyone asking for 4store, but the user base is a lot smaller. - Steve -- Steve Harris, CTO Garlik, a part of Experian +44 7854 417 874 http://www.garlik.com/ Registered in England and Wales 653331 VAT # 887 1335 93 Registered office: Landmark House, Experian Way, Nottingham, Notts, NG80 1ZZ
Received on Wednesday, 29 August 2012 09:08:51 UTC