RFE #616216: Allow sets to be recursive

diff --git a/schema/relaxng/dbhier.rng b/schema/relaxng/dbhier.rng
index a41e263037c28db2a6bbffb1cc96b7f0b3accecf..e9b53dd4d5ebbf7a7dc99352bfebd5df975fbb0c 100644 (file)
--- a/schema/relaxng/dbhier.rng
+++ b/schema/relaxng/dbhier.rng
@@ -394,7 +394,10 @@ of DocBook.</para>
               <ref name="toc"/>
             </optional>
             <oneOrMore>
-              <ref name="book.class"/>
+              <choice>
+                <ref name="set"/>
+                <ref name="book.class"/>
+              </choice>
             </oneOrMore>
             <optional>
               <ref name="setindex"/>