X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fdtd%2Fcic.dtd;h=0e13549d167c41fbb96caee0681aec3f9e9e7062;hb=352196141500ca64f5a0d84218318ed78fdf830a;hp=a0071070e3a2bc1f4d5741f9fb044dad9cbfb8e6;hpb=89d2370db1ef266be1dce32c0f9ca0552f6fe2f7;p=helm.git

diff --git a/helm/dtd/cic.dtd b/helm/dtd/cic.dtd
index a0071070e..0e13549d1 100644
--- a/helm/dtd/cic.dtd
+++ b/helm/dtd/cic.dtd
@@ -79,7 +79,8 @@
 
 <!ELEMENT PROD (source,target)>
 <!ATTLIST PROD
-          id ID #REQUIRED>
+          id   ID     #REQUIRED
+          type %sort; #REQUIRED>
 
 <!ELEMENT CAST (term,type)>
 <!ATTLIST CAST