feat(library): Support XML (SDMX-ML Structure message) for input

Changed the input format from Document object to XML string. Library will convert the XML string to
document object internally (using xmldon in Node).

Input is no longer Document object. Closes #1

README.md

@@ -24,23 +24,18 @@ for a live demo.
 
 ## Usage ##
 
-Just include the library on a web page:
-
-```
-<script src="sdmxmllib.js"></script>
-<script>console.log('sdmxmllib version: ' + sdmxmllib.version);</script>
-```
+Either include the library on a web page or require in Node.js.
 
 ## Mapping ##
 
 ### mapSDMXMLResponse
 
-Maps SDMX-ML Structure message to Javascript objects. Accepts a document object
-as input.
+Maps SDMX-ML Structure message into Javascript objects. Accepts a SDMX-ML 2.1
+Structure Message as input.
 
 ```
 // req is a XMLHttpRequest object
-var msg = sdmxmllib.mapSDMXMLResponse(req.responseXML);
+var msg = sdmxmllib.mapSDMXMLResponse(req.responseText);
 
 console.log(msg.header.id);                 // "IDREF99224"
 console.log(msg.resources.length);          // 10

package.json

@@ -46,5 +46,7 @@
       "pre-commit": "npm run test:single && npm run check-coverage && npm run lint"
     }
   },
-  "dependencies": {}
+  "dependencies": {
+    "xmldom": "0.1.22"
+  }
 }

samples/sdmxmlmap/js/sdmxmlmap.js

@@ -19,7 +19,7 @@
         // Show the raw response text on page
         xmlOutput.textContent = req.responseText;
         // convert XML to javascript objects
-        var json = sdmxmllib.mapSDMXMLResponse(req.responseXML, url);
+        var json = sdmxmllib.mapSDMXMLResponse(req.responseText);
         // Convert to json and show on page
         jsonOutput.textContent = JSON.stringify(json, null, 2);
     };