Message
Affiliation should not be tagged more than once.
Rule XPath:
This rule REPORTS an alert when the following is TRUE:
let $aff := normalize-space(upper-case(translate(string-join(node() except label,
''), '.,;:', ' '))) return.[parent::contrib-group]/preceding-sibling::aff[ normalize-space( upper-case( translate(string-join(node()
except label, ''),'.,;:', ' ') ) ) eq $aff]