arne-bdt commented on issue #3455:
URL: https://github.com/apache/jena/issues/3455#issuecomment-3316161418
> While the filter expression `FILTER(STRSTARTS(?x, "A"))` or
`FILTER(STRSTARTS(?x, "A") && BOUND(?x))` becomes part of the left join (c.f.
SQL `ON`) (top level FILTER in the RHS of OPTIONAL is a special case), the
vcariable is onl inscope to the expression.
>
> Add a layer of `{}` to move the FILTER to be RHS only, before the left
join.
>
> ```
> OPTIONAL { {
> FILTER(STRSTARTS(?x, "A") && BOUND(?x))
> BIND(?x as ?z1)
> } }
> ```
Thank you very much for your quick responses.
I see, that I now get nothing for ?z1 and ?z2.
But I am a bit confused. Simply adding another layer of brackes with nothing
new in between typically does not change behavior.
Which parts of the [SPARQL language
specification](https://www.w3.org/TR/sparql11-query/) do I have to re read with
more caution?
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