Like, when you have an assertion saying that "every member of class A with property p equals to something is also a member of class B", this assertion wou D be a blank node?
Richard, would you give an example of usage of blank nodes in d2r? -- Diogo F.C. Patrão Em 26/04/2012, às 17:33, Richard Cyganiak <[email protected]> escreveu: > Zach, > > Blank node labels in RDF carry no meaning. Systematically renaming all blank > nodes doesn't change anything. It is very common for RDF tools to freely > change blank node labels. In the case of D2RQ, the blank node labels that you > specify in the mapping are retained throughout the engine, but the Jena/ARQ > serializers rename them when generating output. > > If the actual label is important to you, then don't use a blank node. > > (In fact, don't use blank nodes at all, unless you know what you're doing. > Almost no one understands them.) > > Best, > Richard > > > On 26 Apr 2012, at 20:45, Zach Schweinfurth wrote: > >> I have been working on some blank node mappings for the sp2 database. My >> mappings are below. As best I can tell d2r seems to be ignoring the >> table.column I specified for the relevant d2rq:bNodeIdColumns property. The >> values for the Person.stringid column are values such as Paul_Edroes. >> >> When I run, SELECT ?resourceid WHERE { ?resourceid a >> <http://xmlns.com/foaf/0.1/Person> } limit 10, to test the below mapping, I >> am getting results back in that look like >> >> _:b0, _:b1, etc. Based on the mapping, I was expecting the blank nodes to >> look something like _:Paul_Edroes, etc. >> >> Is the column specified in the d2rq:bNodeIdColumns used to create the blank >> nodes? If so, is there something incorrect with my mapping that is causing >> my blank nodes to be formed incorrectly? >> >> Thanks. >> >> >> Mapping: >> >> :Person_BlankNode_Map >> a d2rq:ClassMap ; >> d2rq:bNodeIdColumns "Person.stringid" ; >> d2rq:class foaf:Person ; >> d2rq:dataStorage :SP2_Database ; >> . >> -- >> >> Zach >> >> ------------------------------------------------------------------------------ >> Live Security Virtual Conference >> Exclusive live event will cover all the ways today's security and >> threat landscape has changed and how IT managers can respond. Discussions >> will include endpoint security, mobile security and the latest in malware >> threats. >> http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/_______________________________________________ >> d2rq-map-devel mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/d2rq-map-devel > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > d2rq-map-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/d2rq-map-devel ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ d2rq-map-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/d2rq-map-devel
