+ <!-- Find the work that has a given Instance -->
+ <index type="bf.instance">
+ %v_inst bf:instanceOf ?thing FILTER ( %v_inst = %u)
+ </index>
+
+ <!-- Find all works that refer to the given uri -->
+ <!-- useful after finding uris in the "small" bases -->
+ <!-- direct references only -->
+ <index type="bf.ref">
+ ?thing %v_rel %u
+ </index>
+