Add citation to attribution and make all the components of attribution optional ...

diff --git a/docbook/relaxng/src/pool.rnc b/docbook/relaxng/src/pool.rnc
index 1746fdad8f2e8b136bfd14117d25f55900170ef6..486ca6fd06fd88b85d544d55f49522096fc03bd6 100644 (file)
--- a/docbook/relaxng/src/pool.rnc
+++ b/docbook/relaxng/src/pool.rnc
@@ -1080,7 +1080,7 @@ div {
    db.attribution =
       element attribution {
          db.attribution.attlist,
-         (db._text | db.personname | db.citetitle)+
+         (db._text | db.personname | db.citetitle | db.citation)*
       }
 }