Release 1.17 available

Release 1.17 contains the first version of the client to use the new open Xaira API rather than the old text string server. The old mechanism will be retained in parallel until testing of the new client is more advanced and various known limitations have been addressed. The query language, renamed xxql, is not finalised but users may use this release to test the current spec and are encouraged to comment on the language's usability.