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Relax <reference> tag DTD #122

Closed Girgias closed 5 months ago

Girgias commented 5 months ago

DocBook 5.1 and 5.2 allow "Zero or more of" <refentry>, whereas DocBook 5.0 and below required "One or more of" <refentry>

cf. https://tdg.docbook.org/tdg/5.2/reference