lib/asciidoctor/csd/biblio.rng in metanorma-csd-1.3.8 vs lib/asciidoctor/csd/biblio.rng in metanorma-csd-1.3.9

@@ -636,12 +636,12 @@
       <ref name="accesslocation"/>
     </zeroOrMore>
     <zeroOrMore>
       <ref name="license"/>
     </zeroOrMore>
-    <optional>
+    <zeroOrMore>
       <ref name="bclassification"/>
-    </optional>
+    </zeroOrMore>
     <zeroOrMore>
       <ref name="bkeyword"/>
     </zeroOrMore>
     <optional>
       <ref name="validity"/>