- From: Kingsley Idehen <kidehen@openlinksw.com>
- Date: Thu, 01 Jul 2010 12:42:16 -0400
- To: Yves Raimond <yves.raimond@gmail.com>
- CC: nathan@webr3.org, Pat Hayes <phayes@ihmc.us>, Toby Inkster <tai@g5n.co.uk>, Dan Brickley <danbri@danbri.org>, Linked Data community <public-lod@w3.org>, Semantic Web <semantic-web@w3.org>
Yves Raimond wrote: > Hello! > > >>>> IMHO an emphatic NO. >>>> >>>> RDF is about constructing structured descriptions where "Subjects" have >>>> Identifiers in the form of Name References (which may or many resolve to >>>> Structured Representations of Referents carried or borne by Descriptor >>>> Docs/Resources). An "Identifier" != Literal. >>>> >>>> If you are in a situation where you can't or don't want to mint an HTTP >>>> based Name, simply use a URN, it does the job. >>>> >>>> >>> It does look like you're already using literal subjects in OpenLink >>> Virtuoso though: >>> >>> http://docs.openlinksw.com/virtuoso/rdfsparql.html >>> >>> SQL>SELECT * >>> FROM <people> >>> WHERE >>> { >>> ?s foaf:Name ?name . ?name bif:contains "'rich*'". >>> } >>> >>> Best, >>> y >>> >>> >>> >> Were is the Literal Subject in the query above? >> > > ?name is a literal. And it is used as a subject. > Yves, Here's why its deemed magic/function/unreal predicate (a function selectively working on literal data associated with the URI): 1. http://bit.ly/cQJTWQ -- SPARQL Query Results Page 2. http://bit.ly/acQc4u -- Actual SPARQL Query There isn't an actual Literal Subject in the Virtuoso RDF DBMS. The RDF_QUAD Table explicitly has Column "S" set to type IRI. Here is the actual SQL DML for RDF_QUAD: create table "DB"."DBA"."RDF_QUAD" ( "P" IRI_ID, "S" IRI_ID, "O" ANY, "G" IRI_ID, PRIMARY KEY ("P", "S", "O", "G") ); Kingsley > Best, > y > > >> bif:contains is a function/magic predicate scoped to Literal Objects. >> >> <people> != "people". >> >> What am I missing? >> >> -- >> >> Regards, >> >> Kingsley Idehen President & CEO OpenLink Software Web: >> http://www.openlinksw.com >> Weblog: http://www.openlinksw.com/blog/~kidehen >> Twitter/Identi.ca: kidehen >> >> >> >> >> >> > > -- Regards, Kingsley Idehen President & CEO OpenLink Software Web: http://www.openlinksw.com Weblog: http://www.openlinksw.com/blog/~kidehen Twitter/Identi.ca: kidehen
Received on Thursday, 1 July 2010 16:42:54 UTC