./test/relaxng/tutor8_2_5.xml:1: element head: Relax-NG validity error : Expecting an element title, got nothing ./test/relaxng/tutor8_2_5.xml:1: element head: Relax-NG validity error : Invalid sequence in interleave ./test/relaxng/tutor8_2_5.xml:1: element head: Relax-NG validity error : Element head failed to validate content ./test/relaxng/tutor8_2_5.xml fails to validate