Improve processing instruction node support.

Author: javadev

src/main/java/com/github/underscore/lodash/Xml.java

@@ -937,6 +937,7 @@ private static String getRootName(final Map localMap) {
                 if (String.valueOf(entry.getKey()).startsWith("-")) {
                     foundAttrs += 1;
                 } else if (!String.valueOf(entry.getKey()).startsWith(COMMENT)
+                        && !String.valueOf(entry.getKey()).startsWith("?")
                         && (!(entry.getValue() instanceof List) || ((List) entry.getValue()).size() <= 1)) {
                     foundElements += 1;
                 }

src/test/java/com/github/underscore/lodash/StringTest.java

@@ -2146,6 +2146,14 @@ public void toJsonFromXml24() {
             + "}";
         assertEquals(json, U.toJson((Map<String, Object>) U.fromXml(xml)));
         assertEquals(xml, U.toXml((Map<String, Object>) U.fromJson(json)));
+        final String xml2 = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<?b c=\"d\"?>\n<a></a>";
+        final String json2 = "{\n"
+            + "  \"?b\": \"c=\\\"d\\\"\",\n"
+            + "  \"a\": {\n"
+            + "  }\n"
+            + "}";
+        assertEquals(json2, U.toJson((Map<String, Object>) U.fromXml(xml2)));
+        assertEquals(xml2, U.toXml((Map<String, Object>) U.fromJson(json2)));
     }
 
     @SuppressWarnings("unchecked")