Fix SPARQLResultsTSVWriter to quote xsd:string literals #5262
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Related to eclipse-rdf4j#5256 Update `SPARQLResultsTSVWriter` to ensure all `xsd:string` literals are quoted in SPARQL TSV results. * Modify `writeLiteral` method to always quote `xsd:string` literals. * Remove conditions that allowed `xsd:string` literals to be written without quotes. * Ensure special characters in `xsd:string` literals are properly escaped using `encodeString` method. * Update tests in `SPARQLTSVCustomTest` to verify correct quoting of `xsd:string` literals and proper escaping of special characters. --- For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/eclipse-rdf4j/rdf4j/issues/5256?shareId=XXXX-XXXX-XXXX-XXXX).
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Related to #5256
Update
SPARQLResultsTSVWriterto ensure allxsd:stringliterals are quoted in SPARQL TSV results.writeLiteralmethod to always quotexsd:stringliterals.xsd:stringliterals to be written without quotes.xsd:stringliterals are properly escaped usingencodeStringmethod.SPARQLTSVCustomTestto verify correct quoting ofxsd:stringliterals and proper escaping of special characters.For more details, open the Copilot Workspace session.