One thing I've been using a triple store for recently is to model a lexicographic dataset extracted from a bunch of TEI files. The TEI XML files are transcriptions of lexicons of various Australian aboriginal languages; tables of English language words, with their equivalents supplied by native speakers of those languages, in outback Australia in the early 20th C.
For this aboriginal language project I wrote XSLT that converts one of these TEI files into an RDF/XML file in which the lexicographic data in the TEI is encoded in SKOS (a thesaurus vocabulary). I apply that stylesheet to each TEI file, and take the resulting RDF/XML file and store it in the RDF graph store with an HTTP PUT. Then I wrote SPARQL queries to query over the union of all those graphs, to extract statistics and analyze the full dataset. Using a triple store and a SPARQL query interface makes it much easier and more efficient to query the lexicographic data than it would be to query it directly from the TEI XML, using e.g. XQuery, For my triple store I chose to use Apache Fuseki, because it implements all the SPARQL 1.1 protocols including the Graph Store HTTP Protocol < http://www.w3.org/TR/sparql11-http-rdf-update/>. The crucial thing with the SPARQL 1.1 HTTP Graph Store protocol is that your unit of data management is not at the level of individual triples, but at the level of groups of triples - "Named Graphs" - which are very much the same as the concept of a "record" in traditional data management systems. So although it's possible to use the older SPARQL Update Protocol to manage your RDF data, I think it's generally much easier to use the SPARQL Graph Store HTTP Protocol interface to keep the RDF up to date and in synch with the source data. In the SPARQL Update Protocol, you send the SPARQL server a command that inserts and/or deletes triples; so it's a kind of Remote Procedure Call style of protocol. Whereas the Graph Store protocol is resource-oriented (RESTful); you simply identify a bunch of triples (a "Named Graph"), and use HTTP PUT to overwrite them with a new bunch of triples, or DELETE to remove them altogether, or POST to add new triples to the graph. On 20 December 2014 at 01:00, Forrest, Stuart <sforr...@bcgov.net> wrote: > Hi All > > My question is what do you guys use triplestores for? > > Thanks > Stuart > > > > ================================================================================ > Stuart Forrest PhD > Library Systems Specialist > Beaufort County Library > 843 255 6450 > sforr...@bcgov.net > > http://www.beaufortcountylibrary.org > > For Leisure, For Learning, For Life > > > > -----Original Message----- > From: Code for Libraries [mailto:CODE4LIB@LISTSERV.ND.EDU] On Behalf Of > Stefano Bargioni > Sent: Monday, November 11, 2013 8:53 AM > To: CODE4LIB@LISTSERV.ND.EDU > Subject: Re: [CODE4LIB] rdf triplestores > > My +1 for Joseki. > sb > > On 11/nov/2013, at 06.12, Eric Lease Morgan wrote: > > > What is your favorite RDF triplestore? > > > > I am able to convert numerous library-related metadata formats into > RDF/XML. In a minimal way, I can then contribute to the Semantic Web by > simply putting the resulting files on an HTTP file system. But if I were to > import my RDF/XML into a triplestore, then I could do a lot more. Jena > seems like a good option. So does Openlink Virtuoso. > > > > What experience do y'all have with these tools, and do you know how to > import RDF/XML into them? > > > > -- > > Eric Lease Morgan > > >
