Add data blocks to rule set

Author: afs

shacl12-inf-rules/index.html

@@ -804,7 +804,8 @@ <h2>Shape Rules Abstract Syntax</h2>
 
           <dt><dfn>rule set</dfn></dt>
           <dd>
-            A <em>rule set</em> is a collection of zero or more rules.
+            A <em>rule set</em> is a collection of zero or more [=rules=] 
+            and a collection of zero or more [=data blocks=].
           </dd>
         </dl>