galgonek opened a new issue, #2995:
URL: https://github.com/apache/jena/issues/2995
### Version
Generating of syntactically incorrect queries when evaluating a service
pattern
### What happened?
I have noticed that during the evaluation of a federated query, Jena
performs substitution of a variable for a RDF term even in cases where the
given RDF term cannot be valid.
This can be demonstrated by the following federated query:
```sparql
SELECT * WHERE {
VALUES ?P { "literal" }
SERVICE <https://idsm.elixir-czech.cz/sparql/endpoint/idsm> {
?S ?P ?O.
}
}
```
Jena sends the following query to the endpoint:
```sparql
SELECT *
WHERE
{ ?S "literal" ?O }
```
However, such a query is not syntactically correct.
### Relevant output and stacktrace
```shell
```
### Are you interested in making a pull request?
None
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