later SRU implementation.
Sort by title, date, author. Parameter to 'show' webservice command.
Additional facets. At least do 'author'.. think about making it general. -- libxml
-Support for 'blocking' requests, at least for record display before first records
- are retrieved (to reduce polling).
Implement detection of 'search complete', so client knows when to stop polling.
Full record retrieval. -- libxml
Implement hitsbytarget function to emulate traditional LOT-style U/I