Add parser function nodes for XML, JSON and CSV.

Each is dual function - pass in (for example) and get out a js object, pass in a js object and get back out the xml string.
The CSV node must be configured with a column template that specifys the required property names for that column (csv->js), or the properties of the object that should be made into the csv (js->csv)

nodes/core/parsers/70-XML.js

@@ -0,0 +1,50 @@
+/**
+ * Copyright 2014 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+var RED = require(process.env.NODE_RED_HOME+"/red/red");
+var xml2js = require('xml2js');
+var parseString = xml2js.parseString;
+var builder = new xml2js.Builder({renderOpts:{pretty:false}});
+
+function XMLNode(n) {
+    RED.nodes.createNode(this,n);
+    var node = this;
+    this.on("input", function(msg) {
+        if (msg.hasOwnProperty("payload")) {
+            if (typeof msg.payload == "object") {
+                try {
+                    msg.payload = builder.buildObject(msg.payload);
+                    node.send(msg);
+                }
+                catch(e) { node.log(e); }
+            }
+            else if (typeof msg.payload == "string") {
+                try {
+                    parseString(msg.payload, {strict:true,async:true}, function (err, result) {
+                        if (err) { node.error(err); }
+                        else {
+                            msg.payload = result;
+                            node.send(msg);
+                        }
+                    });
+                }
+                catch(e) { node.log(e); }
+            }
+            else { node.log("This node only handles xml strings or js objects."); }
+        }
+    });
+}
+RED.nodes.registerType("xml",XMLNode);