Fix typo: renderas optional on bridgehead

diff --git a/docbook/relaxng/src/pool.rnc b/docbook/relaxng/src/pool.rnc
index ceefb255a98634e5c1dadc9e5e9d56518d0bcb3f..c5b818f3f8af80eea4abd7d8d51a408592aed38e 100644 (file)
--- a/docbook/relaxng/src/pool.rnc
+++ b/docbook/relaxng/src/pool.rnc
@@ -1011,7 +1011,7 @@ div {
       db.bridgehead.role.attribute?
     & db.common.attributes
     & db.common.linking.attributes
-    & attribute renderas { "other" | "sect1" | "sect2" | "sect3" | "sect4" | "sect5"  }
+    & attribute renderas { "other" | "sect1" | "sect2" | "sect3" | "sect4" | "sect5"  }?
 
    db.bridgehead =
       element bridgehead {