A <remarks> dated 2005-01-14 in the tagdoc for <list> says
<!-- schematron constraint needed here -->
<p>The formal syntax of the element declarations allows
<gi>label</gi> tags to be omitted from lists tagged <tag>list
type="gloss"</tag>; this is however a semantic error.</p>
I’m thinking it would be very good to create that schematron constraint in under decade.
I agree, but I also think we should replace this structure in the recommendation with something properly hierarchical, like
While I agree w/ Martin, that's not something that can be quickly fixed as a bug report.
Fixed in revision 13046.