Message
CRediT role with degree-contribution="equal" should be present for more than one contributor:
.
Rule XPath:
This rule ASSERTS the following, raising an alert if FALSE:
not(@vocab = 'credit' and @degree-contribution = 'equal') or
(some $role in (../../*/role except .)
satisfies ($role/@vocab-term-identifier = @vocab-term-identifier or $role/@vocab-term
= @vocab-term)
and $role/@degree-contribution = 'equal')