Returns the value of a named server field. A server field is created with
xdmp:set-server-field and stores a name/value
pair in memory. The server field is available on the App Server in which
it is set on the host in which the App Server runs, via
xdmp:get-server-field; a server field that is set on one
App Server is not available on other App Servers on that host or on the same
App Server running on another host. Server fields are commonly used
with the system Plugin Framework.
|$name||The name of the server field.|
|$default||A default value to return if there is no server field.|
xdmp.getServerField("foo"); => "bar"