DXML-35 alternate approach to newline after preamble

this avoids an IllegalArgumentException

Author: bendlas

src/main/clojure/clojure/data/xml/jvm/pprint.clj

@@ -14,11 +14,11 @@
 
 (defn ^Transformer indenting-transformer []
   (doto (-> (TransformerFactory/newInstance) .newTransformer)
-    (.setOutputProperty (OutputKeys/INDENT) "yes")
-    (.setOutputProperty (OutputKeys/METHOD) "xml")
+    (.setOutputProperty OutputKeys/INDENT "yes")
+    (.setOutputProperty OutputKeys/METHOD "xml")
     (.setOutputProperty "{http://xml.apache.org/xslt}indent-amount" "2")
-    ;; print newline after preamble https://bugs.openjdk.java.net/browse/JDK-7150637
-    (.setOutputProperty "http://www.oracle.com/xml/is-standalone" "yes")))
+    ;; print newline after preamble
+    (.setOutputProperty OutputKeys/DOCTYPE_PUBLIC "yes")))
 
 (defn indent-xml
   [xml-str ^Writer writer]