Per database config.
+Explain always returned even though database/path is wrong.
+
Control the various optimizations with config..
Live status (via search, present).
Deal with Z39.50 messages sizes properly.
-For SRW/SRU, set schema for each returned record.
-
Character set conversion for SRW queries.
Throw proper CQL conversion error.
+Honor XPath.
+
+Deal with scan, sort (throw diagnostic).
+