-[h:head]
-+ h:title (entity:xmlvalue)
-+ h:base (entity:xmlvalue)
-+ h:style (entity:xmlvalue) multiple
-+ h:meta (entity:xmlvalue) multiple
-+ h:link (entity:xmlvalue) multiple
-+ h:script (entity:xmlvalue) multiple
-
-[h:html]
-+ h:head (h:head)
-+ h:body (nt:unstructured)