Honestly, I don't know why anyone would use anything other than TBC's free SPARQL editor for learning or developing SPARQL queries :) A syntax-directed editor, autocomplete, instant execution. Difficult to find better.
Insofar as SPARQL processing is concerned, the tools you mention use a SPARQL engine in the background, possibly the same Jena ARQ engine TBC uses. They parse SPARQL syntax and convert to a SPARQL algebra (see the SPARQL standard for more) that is executed against the data store. The data is returned in whatever RDF format the engine supports and the middleware needs. That is similar. but distinct from a SPARQL endpoint, which is a Web service that takes SPARQL syntax as input and returns and XML encoding of a SPARQL result set. Basically it's a HTTP protocol. You can find the W3C recommendation at http://www.w3.org/TR/rdf-sparql-protocol/. The article you reference is on the TQ blog at at http://topquadrantblog.blogspot.com/2011/03/how-to-extend-ontology.html. It's specific to SKOS ontologies, but the principle is the same. Have you looked at the TBC Getting Started Guide? There are exercises, etc. and will give you a lot of information on what ontologies are and how to use them. See http://www.topquadrant.com/products/support.html. Lots of good starter stuff on that page. Also, a good starting point may be TopBraid Ensemble - see http://www.topquadrant.com/products/TB_Ensemble.html. It's basically the same concept as a wiki - collaborative editing - just a different interface. Microformats and schema.org made a bit of a splash last year and not much since then. RDFa also get some uptake now and again. Both are ways of embedding RDF in HTML. TopBraid Suite supports both formats. -- Scott On Mar 13, 8:08 pm, Bruce Whealton <[email protected]> wrote: > Hello all, > This may be a bit off topic. I was reading Bob DuCharme's book > on "Learning Sparql" and sometimes I get caught up on semantics (no pun > intended). I had posted something on answers.semanticweb.com about wanting > to query against an RDF file using SPARL. Some folks recommended ARC 2 > (php) or SPARK (JavaScript). Someone else recommended a Perl script. So, > at the risk of being pedantic, if these tools let me use SPARQL to query > data in an RDF file that is in folder relative to my website, does that > mean that each of these tools is serving as a SPARQL endpoint? > The other reason I was posting this here was that I remember Bob > mentioning an article on extending and using using an existing vocabulary. > I cannot find that article or link. > At this point, I am using MediaWiki and the Semantic MediaWiki bundle. > I think Top Quadrants offerings can improve the User Interaction and offer > different or more user friendly features. > I am also curious about schema.org in that it was created by the > search engines to be used for creating enhanced search results. This can > be represented as RDF/XML also, though. To what advantage is this? > Google, Bing, Yahoo are not indexing RDF/XML files are they? > Thanks, > Bruce -- You received this message because you are subscribed to the Google Group "TopBraid Suite Users", the topics of which include Enterprise Vocabulary Network (EVN), TopBraid Composer, TopBraid Live, TopBraid Ensemble, SPARQLMotion and SPIN. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/topbraid-users?hl=en
