asserts/puzzles.xsd in pdd-0.3 vs asserts/puzzles.xsd in pdd-0.4

@@ -71,9 +71,11 @@
   <xs:element name="puzzles">
     <xs:complexType>
       <xs:sequence>
         <xs:element name="puzzle" type="puzzle" minOccurs="0" maxOccurs="unbounded" />
       </xs:sequence>
+      <xs:attribute name="version" use="required" type="xs:string"/>
+      <xs:attribute name="date" use="required" type="xs:dateTime"/>
     </xs:complexType>
     <xs:unique name="puzzleBody">
       <xs:selector xpath="./puzzle" />
       <xs:field xpath="body" />
     </xs:unique>
\ No newline at end of file