diff --git a/xml/dtd/genericdocument.xsd b/xml/dtd/genericdocument.xsd
index 10300cf..6e6444d 100644
--- a/xml/dtd/genericdocument.xsd
+++ b/xml/dtd/genericdocument.xsd
@@ -30,8 +30,6 @@
     </xs:complexType>
   </xs:element>
 
-  <xs:element name="subtitle" type="xs:string"/>
-
   <xs:element name="collaborators">
     <xs:complexType>
       <xs:sequence>