2 Used to record the protocol that should be used to connect to the
3 server. The default value is
4 <a target="_blank" href="http://lcweb.loc.gov/z3950/agency/"
7 <a target="_blank" href="http://www.loc.gov/standards/sru/srw/"
9 <a target="_blank" href="http://www.loc.gov/standards/sru/"
11 and <tt>SRW/U</tt> are also possible values. <tt>SRW/U</tt> means
12 that both versions of the web service are available at the same URL