Keywords can be used as a function with a map, so the keyword will search
for itself in the map. Take a look at
http://clojure.org/data_structures#Data%20Structures-Keywords
In the case of the "ns" form, as James pointed out, what is happening is
not a function call. ns is a macro and as such that form will be
transformed before actual evaluation occurs. If you want, you can see the
actual call that will be made when evaluating ns, you can do so by
expanding the macro with:
(macroexpand-1 '(ns org.currylogic.damages.http.expenses
(:require [clojure.data.json :as json-lib]
[clojure.xml :as xml-core])))
Be aware though that the resulting form may be a little daunting :-)
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