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+;;; xml.clj -- a pretty print dispatch version of prxml.clj -- a compact syntax for generating XML
+
+;; by Tom Faulhaber, based on the original by Stuart Sierra, http://stuartsierra.com/
+;; May 13, 2009
+
+;; Copyright (c) 2009 Tom Faulhaber/Stuart Sierra. All rights reserved.  The use and
+;; distribution terms for this software are covered by the Eclipse
+;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
+;; which can be found in the file epl-v10.html at the root of this
+;; distribution.  By using this software in any fashion, you are
+;; agreeing to be bound by the terms of this license.  You must not
+;; remove this notice, or any other, from this software.
+
+
+;; See function "prxml" at the bottom of this file for documentation.
+
+
+(ns 
+  #^{:author "Tom Faulhaber, based on the original by Stuart Sierra",
+     :doc "A version of prxml that uses a pretty print dispatch function."}
+  clojure.contrib.pprint.examples.xml
+  (:use [clojure.contrib.lazy-xml :only (escape-xml)]
+        [clojure.contrib.java-utils :only (as-str)]
+        [clojure.contrib.pprint :only (formatter-out write)]
+        [clojure.contrib.pprint.utilities :only (prlabel)]))
+
+(def
+ #^{:doc "If true, empty tags will have a space before the closing />"}
+ *html-compatible* false)
+
+(def
+ #^{:doc "The number of spaces to indent sub-tags."}
+ *prxml-indent* 2)
+
+(defmulti #^{:private true} print-xml-tag (fn [tag attrs content] tag))
+
+(defmethod print-xml-tag :raw! [tag attrs contents]
+  (doseq [c contents] (print c)))
+
+(defmethod print-xml-tag :comment! [tag attrs contents]
+  (print "<!-- ")
+  (doseq [c contents] (print c))
+  (print " -->"))
+
+(defmethod print-xml-tag :decl! [tag attrs contents]
+  (let [attrs (merge {:version "1.0" :encoding "UTF-8"}
+                     attrs)]
+    ;; Must enforce ordering of pseudo-attributes:
+    ((formatter-out "<?xml version=\"~a\" encoding=\"~a\"~@[ standalone=\"~a\"~]?>") 
+     (:version attrs) (:encoding attrs) (:standalone attrs))))
+
+(defmethod print-xml-tag :cdata! [tag attrs contents]
+  ((formatter-out "<[!CDATA[~{~a~}]]>") contents))
+
+(defmethod print-xml-tag :doctype! [tag attrs contents]
+  ((formatter-out "<[!DOCTYPE [~{~a~}]]>") contents))
+
+(defmethod print-xml-tag :default [tag attrs contents]
+  (let [tag-name (as-str tag)]
+    (if (seq? contents)
+      ((formatter-out "~<~<<~a~1:i~{ ~:_~{~a=\"~a\"~}~}>~:>~vi~{~_~w~}~0i~_</~a>~:>")
+       [[tag-name (map #(vector (as-str (key %)) (as-str (val %))) attrs)] *prxml-indent* contents tag-name])
+      ((formatter-out "~<<~a~1:i~{~:_ ~{~a=\"~a\"~}~}/>~:>") [tag-name attrs]))))
+
+
+(defmulti #^{:private true} print-xml class)
+
+(defmethod print-xml clojure.lang.IPersistentVector [x]
+  (let [[tag & contents] x
+        [attrs content] (if (map? (first contents))
+                          [(first contents) (rest contents)]
+                          [{} contents])]
+    (print-xml-tag tag attrs content)))
+
+(defmethod print-xml clojure.lang.ISeq [x]
+  ;; Recurse into sequences, so we can use (map ...) inside prxml.
+  (doseq [c x] (print-xml c)))
+
+(defmethod print-xml clojure.lang.Keyword [x]
+  (print-xml-tag x {} nil))
+
+(defmethod print-xml String [x]
+  (print (escape-xml x)))
+
+(defmethod print-xml nil [x])
+
+(defmethod print-xml :default [x]
+  (print x))
+
+
+(defn prxml
+  "Print XML to *out*.  Vectors become XML tags: the first item is the
+  tag name; optional second item is a map of attributes.
+
+  Sequences are processed recursively, so you can use map and other
+  sequence functions inside prxml.
+
+    (prxml [:p {:class \"greet\"} [:i \"Ladies & gentlemen\"]])
+    ; => <p class=\"greet\"><i>Ladies &amp; gentlemen</i></p>
+
+  PSEUDO-TAGS: some keywords have special meaning:
+
+    :raw!      do not XML-escape contents
+    :comment!  create an XML comment
+    :decl!     create an XML declaration, with attributes
+    :cdata!    create a CDATA section
+    :doctype!  create a DOCTYPE!
+
+    (prxml [:p [:raw! \"<i>here & gone</i>\"]])
+    ; => <p><i>here & gone</i></p>
+
+    (prxml [:decl! {:version \"1.1\"}])
+    ; => <?xml version=\"1.1\" encoding=\"UTF-8\"?>"
+  [& args]
+  (doseq [arg args] (write arg :dispatch print-xml))
+  (when (pos? (count args)) (newline)))