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Update listToRdf method to use nullable IRI type #116

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Update listToRdf method to use nullable IRI type #116

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2 changes: 1 addition & 1 deletion Processor.php
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Original file line number Diff line number Diff line change
Expand Up @@ -2232,7 +2232,7 @@ private function elementToRdf(JsonObject $element)
*
* @return IRI Returns the IRI of the head of the list
*/
private function listToRdf(array $entries, array &$quads, IRI $graph = null)
private function listToRdf(array $entries, array &$quads, ?IRI $graph = null)
{
if (0 === count($entries)) {
return new IRI(RdfConstants::RDF_NIL);
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