-Control the various optimizations with config..
+Proxy doesn't do well, if preferredRecordSyntax is not set.
-Handle invalidate sessions (-1 hit, control-number search).
+Per database config.
-Live status (via search, present).
+Control the various optimizations with config..
-SRW/SRU.
+Live status (via search, present).
Possible threading.
+Deal with Z39.50 messages sizes properly.
+
+Character set conversion for SRW queries.
+
+Throw proper CQL conversion error.
+
+Honor XPath.
+