isodoc.rng in metanorma-mpfd-0.1.7

- old
+ new

@@ -492,9 +492,12 @@
     <element name="sourcecode">
       <attribute name="id">
         <data type="ID"/>
       </attribute>
       <optional>
+        <attribute name="lang"/>
+      </optional>
+      <optional>
         <ref name="tname"/>
       </optional>
       <oneOrMore>
         <choice>
           <text/>