1 ./test/relaxng/tutor6_2_4.xml:4: element preferredFormat: Relax-NG validity error : Error validating value 2 ./test/relaxng/tutor6_2_4.xml:4: element preferredFormat: Relax-NG validity error : Element preferredFormat failed to validate content 3 ./test/relaxng/tutor6_2_4.xml fails to validate 4
