Couple questions about  result set semantics:
http://www.loc.gov/z3950/agency/zing/srw1-1/result-sets.html

(1)
"If the result of the query would modify an existing result set, then the
server must supply a new id for this new set."
Is sorting an existing set the only thing we have in mind, or something else
too?


(2)
"The 'resultSetTTL' parameter may be supplied to explicitly request a time
to live for the result set created by the query. This is the number of
seconds for which the client is requesting that the server keep the database
around."

If the client doesn't want a result set (doesn't care), does it (1) supply a
value of zero, or (2) omit the parameter (or (3) either)? I recall we
discussed this but I don't remember the result.

--Ray