Message
xref
has @ref-type="collab" but does not point to an element <contrib-group content-type="investigator-list">
Rule XPath:
This rule REPORTS an alert when the following is TRUE:
@ref-type = 'collab' and not(every $rid in tokenize(@rid, '\s+') satisfies key('element-by-id',
$rid)[self::contrib-group[@content-type = 'investigator-list']])