I would like to experiment with named graphs in Composer. My goal is to move a number of file-based ontologies into named graphs in a tdb instance and manage them in tdb as named graphs.
I created a tdb database in Composer and opened it. I assume I can use the SPARQL editor to interact with the TDB instance and create (multiple) named graphs and populate them. After creating the TDB instance, I executed SPARQL queries to create a named graph, insert data into it, and query it, but is does not seem to work as I expect it to. Here are the queries that I ran in sequential order: CREATE GRAPH <http://bedrock.com/test> (no errors) INSERT DATA {GRAPH <http://bedrock.com/test>{<http://bedrock.com#fred> <http://bedrock.com#name> "Fred Flintstone". <http://bedrock.com#wilma> <http://bedrock.com#name> "Wilma Flintstone". }} (no errors) SELECT * FROM <http://bedrock.com/test> WHERE {?s ?p ?o} (This results in "failure to retrieve query results.) ...So since that did not work, I then tried importing a graph from the workspace into TDB using "Import RDF Files into a new TDB"; however the import wizard does not let me add files to import into TDB. So that did not work either. ...Then I tried the SPARQL Load INTO GRAPH command. LOAD <FILE://.../my.ttl> INTO GRAPH <http://mygraph> SELECT * FROM <http://mygraph> WHERE {?s ?p ?o} And that worked fine and I loaded a few more rdf files, one into the default graph and the rest into named graphs. Then returning to try inserting into the default graph, I was successful with INSERT DATA {<http://bedrock.com#fred> <http://bedrock.com#name> "Fred Flintstone". <http://bedrock.com#wilma> <http://bedrock.com#name> "Wilma Flintstone". } SELECT * WHERE {?s ?p ?o} I think that my assumption that a TDB database in the Composer workspace would work like a project containing multiple models is probably wrong. I have a couple of questions: 1) Is the intended use in Composer that you only have one graph per TDB instance? 2) If multiple graphs are allowed, and I create multiple named graphs in a TDB instance, is there a way to switch between these named graphs in Composer? 3) Is INSERT DATA only supported for the default graph, and not into a named graph? Thanks. A -- -- 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 Insight, SPARQLMotion, SPARQL Web Pages and SPIN. To post to this group, send email to topbraid-users@googlegroups.com To unsubscribe from this group, send email to topbraid-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/topbraid-users?hl=en --- You received this message because you are subscribed to the Google Groups "TopBraid Suite Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to topbraid-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
