--- metadata.dtd
+++ metadata.dtd
@@ -5,7 +5,7 @@
 <!ATTLIST catmetadata pkgname CDATA "">
 
 <!-- Metadata for a package -->
-<!ELEMENT pkgmetadata ( (herd|maintainer|longdescription|use|upstream)* )>
+<!ELEMENT pkgmetadata ((maintainer|longdescription|use|upstream)*,herd,(herd|maintainer|longdescription|use|upstream)*) >
 <!ATTLIST pkgmetadata pkgname CDATA "">
 
   <!-- One tag for each herd this package is assigned to. -->