Message
article-type attribute ((@article-type, 'no article type specified')[1]) should be an allowed valueif (front/article-meta/article-categories/subj-group[@subj-group-type = 'article-type'])
then (': try ', front/article-meta/article-categories/subj-group[@subj-group-type
= 'article-type']/subject/replace(lower-case(.), '\s+', '-')) else (' from the list:
', string-join($article-types[position() ne last()], ', '), ', or ', $article-types[last()])