lib/metanorma/generic/basicdoc.rng in metanorma-generic-2.0.2 vs lib/metanorma/generic/basicdoc.rng in metanorma-generic-2.0.3

@@ -171,12 +171,14 @@
       <optional>
         <attribute name="date">
           <data type="dateTime"/>
         </attribute>
       </optional>
-      <attribute name="from">
-        <data type="IDREF"/>
-      </attribute>
+      <optional>
+        <attribute name="from">
+          <data type="IDREF"/>
+        </attribute>
+      </optional>
       <optional>
         <attribute name="to">
           <data type="IDREF"/>
         </attribute>
       </optional>