Service variables

I was just looking over the 5.2 release notes and was wondering what a service variable was.

Up until now Stardog allowed only constant IRIs in SERVICE queries but with Stardog 5.2 we support variables with the service keyword. This features lets you dynamically select which endpoint(s) to use in federated queries as in:

   ?service a MyService .

   SERVICE ?service {

You can use VALUES or whatever SPARQL pattern you want to bind the service variable and the query inside the SERVICE block will be executed against each matching endpoint.


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