Github user afs commented on the issue: https://github.com/apache/jena/pull/473 @hartig - see PR #507 ; that should allow you to `ResultSetWriterRegistry.register(SPARQLResultSetText, <YourCodeFactory>)` to set your own text output engine. For grabbing the prologue, see: https://github.com/apache/jena/pull/507/files#diff-6efebeadd02ab276d49ddc9bf99f0758R117
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