afs commented on issue #1314:
URL: https://github.com/apache/jena/issues/1314#issuecomment-1148660109
Either. We don't have to stay within strict SPARQL syntax because the
meaning of the evaluation is engine specific so custom syntax is not a
restriction except on 3rd party UI tools.
(first pass): Stardog looking like "SERVICE" is used only for a stored query
but could be extended to "SERVICE { annotate { subquery } }". The meaning
variables in "annotate" is quoting.
Ontotext is inline query, possible less clear to the user with the use of
VALUES
We can have both! Nice syntax and a forced syntax.
`LOOP (?v1 ?v2) { subquery }` which loops on the LHS.
(there are other kinds of correlated query - EXISTS is a correlated ASK; and
like SQL, there could be a filter function "IN { }").
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