+ UriManager.IllFormedUri _ ->
+ try
+ (* this too! *)
+ let NReference.Ref (uri,_) = NReference.reference_of_string v in
+ let ouri = NCic2OCic.ouri_of_nuri uri in
+ UriManager.buri_of_uri ouri = baseuri
+ with
+ NReference.IllFormedReference _ ->
+ false (* v is a description, not a URI *)