@field is supported and @items is not mandatory.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@30331 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/resources/lib/form/repeatable.jelly

@@ -74,8 +74,11 @@ THE SOFTWARE.
     <st:attribute name="name">
       name used in the structured form submission. Defaults to the same name as @var.
     </st:attribute>
-    <st:attribute name="items" use="required">
-      The item collection to loop over.
+    <st:attribute name="field">
+      Used for the data binding.
+    </st:attribute>
+    <st:attribute name="items">
+      The item collection to loop over. Required unless @field is given. 
     </st:attribute>
     <st:attribute name="noAddButton">
       true if the default 'add' button (that adds a new copy) shouldn't be displayed.