diff --git a/test-cases/RMLTC0023a-XML/mapping.ttl b/test-cases/RMLTC0023a-XML/mapping.ttl
index b7095040..e8037de1 100644
--- a/test-cases/RMLTC0023a-XML/mapping.ttl
+++ b/test-cases/RMLTC0023a-XML/mapping.ttl
@@ -6,12 +6,12 @@
     rml:logicalSource [ a rml:LogicalSource ;
             rml:iterator "/persons/person" ;
             rml:referenceFormulation rml:XPath ;
-            rml:source <_:b347486> ] ;
+            rml:source _:b347486 ] ;
     rml:predicateObjectMap [ rml:objectMap [ rml:reference "@amount" ] ;
             rml:predicate ex:owes ] ;
     rml:subjectMap [ rml:class foaf:Person ;
             rml:template "http://example.com/{@fname};{@lname}" ] .
 
-<_:b347486> a rml:RelativePathSource ;
+_:b347486 a rml:RelativePathSource ;
     rml:path "ious.xml" .