cluster_search/commit

Add oa namespace to backward search.

diff --git a/lib/cluster_search/rdf_backward_search.pl b/lib/cluster_search/rdf_backward_search.pl
index 562047c..257b332 100644
--- a/lib/cluster_search/rdf_backward_search.pl
+++ b/lib/cluster_search/rdf_backward_search.pl
@@ -22,7 +22,7 @@
 :- meta_predicate
 	rdf_backward_search(+, 1, -, +).
 
-:- rdf_register_prefix(aat, 'http://vocab.getty.edu/aat/').
+:- rdf_register_prefix(oa, 'http://www.w3.org/ns/oa#').
 
 %%	rdf_backward_search(+Keyword, :TargetCond, -State, +Options)
 %