The future is XML-with-namespaces: POM files and whatnot.  Such cases are 
tricky because more than one notation is possible.  You need a 
namespace-enabled parser to figure out what the XML text really means.  
Luckily, a contributed project, clojure.data.xml, can read 
XML-with-namespaces, and in good idiom return Clojure-namespaced keywords 
for the element names.  (Its present version is 0.1.0-beta1, a 
work-in-progress.)  You configure the namespaces to keywordize as its 
README illustrates:

(declare-ns "xml.html" "http://www.w3.org/1999/xhtml";)
(parse-str "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
            <foo:html xmlns:foo=\"http://www.w3.org/1999/xhtml\";>
...

Could the same effect be obtained without the global state of namespace 
mappings?  Do all uses of clojure.data.xml in an app, even fully 
encapsulated uses, have to agree about the keyword for any given well-known 
XML namespace URI?

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