afs commented on issue #1526:
URL: https://github.com/apache/jena/issues/1526#issuecomment-1242666783

   Is the error before the request is sent?
   
   That would be because `rsparql` doesn't know that it is an aggregate 
function. Aggregators have to be declared to be parsed correctly otherwise they 
look like plain function calls.
   
   You could add custom Jena initialization code to the classpath to declare 
the aggregates.
   
   Or when the far end is ARQ, you can use the AGG syntax to indicate an 
aggregate.
   
   ```
   select ?s1 (AGG set:collect(?loc2) as ?loc2s) {
   ```
   
   except `rsparql` accepts strict SPARQL 1.1 so it needs a tweak for that.
   


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