HolgerKnublauch commented on issue #3267:
URL: https://github.com/apache/jena/issues/3267#issuecomment-2991726167

   It worked well with initialBindings. If pre-binding blank nodes is not 
supported in UPDATEs then I guess the API should throw an error.
   
   I hope it's just an oversight and the old behavior can be implemented for 
substitution too, as it otherwise significantly reduces the utility of SPARQL 
in Jena. In many use cases it is unpredictable whether a subject is a IRI or a 
blank node. If SPARQL can only be used for the former, I (and our customers) 
would need to replace all usages of SPARQL in programs and fall back to an API 
such the Graph API where blank nodes have predictable identities.


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