@prefix sh: <http://www.w3.org/ns/shacl#> .
@prefix ex: <http://example.org/shacl-test/> .

ex:s1 a sh:NodeShape ;
  sh:targetClass ex:C1 ;
  sh:xone ( ex:s2 ex:s2 ) .
ex:s2 sh:class ex:C2 .