Message
Plain Language Summary abstract should have @abstract-type="plain-language-summary" and title "Plain Language Summary"
Rule XPath:
This rule ASSERTS the following, raising an alert if FALSE:
(@abstract-type = ('plain-language-summary', 'summary') and matches(normalize-space(title),
'^plain language summary$', 'i')) or (empty(.//text()[matches(normalize-space(), 'plain
language summary', 'i')]) and not(@abstract-type = 'plain-language-summary'))