start_date must be optional

In order for the schema to support an empty `<free_to_read/>` element, the `start_date` attribute must be optional.
CrossRef · Apr 16, 2015 · 730c836 · 730c836
1 parent ae51d89
commit 730c836
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/niso-ali-1.0.xsd b/niso-ali-1.0.xsd
@@ -4,7 +4,7 @@
   <xsd:element name="free_to_read">
     <xsd:complexType>
       <xsd:attribute name="end_date" use="optional" type="xsd:date"/>
-      <xsd:attribute name="start_date" use="required" type="xsd:date"/>
+      <xsd:attribute name="start_date" use="optional" type="xsd:date"/>
     </xsd:complexType>
   </xsd:element>
   <xsd:element name="license_ref">