Support default namespace

2 files changed, 23 insertions, 7 deletions

diff --git a/lib/xml/writer.js b/lib/xml/writer.js
index 66cc8de..9bf8c35 100644
--- a/lib/xml/writer.js
+++ b/lib/xml/writer.js
@@ -25,9 +25,10 @@ function writeString(root, namespaces) {
     }
     
     function mapElementName(name) {
-        var longFormMatch = /^\{(.*)\}(.*)$/.exec(name);
+        var longFormMatch = /^\{(.*)\}:(.*)$/.exec(name);
         if (longFormMatch) {
-            return uriToPrefix[longFormMatch[1]] + ":" + longFormMatch[2];
+            var prefix = uriToPrefix[longFormMatch[1]];
+            return prefix + (prefix === "" ? "" : ":") + longFormMatch[2];
         } else {
             return name;
         }
@@ -35,14 +36,15 @@ function writeString(root, namespaces) {
     
     function writeDocument(root) {
         var builder = xmlbuilder
-            .create(root.name, {
+            .create(mapElementName(root.name), {
                 version: '1.0',
                 encoding: 'UTF-8',
                 standalone: true
             });
         
         _.forEach(namespaces, function(uri, prefix) {
-            builder.attribute("xmlns:" + prefix, uri);
+            var key = "xmlns" + (prefix === "" ? "" : ":" + prefix);
+            builder.attribute(key, uri);
         });
         
         root.children.forEach(function(child) {
diff --git a/tests/xml/writer.tests.js b/tests/xml/writer.tests.js
index 6c414c0..7f9440f 100644
--- a/tests/xml/writer.tests.js
+++ b/tests/xml/writer.tests.js
@@ -44,21 +44,35 @@ describe('xml.writer', function() {
             '<root><album>Everything in Transit</album></root>');
     });
     
+    test('can write root element with long-form prefix when URI is namespace', function() {
+        var element = xml.element("{music}:root");
+        assertXmlString(element, {"m": "music"},
+            '<m:root xmlns:m="music"/>');
+    });
+    
     test('can write child elements with long-form prefix when URI is namespace', function() {
-        var element = xml.element("root", {"m": "music"}, [
-            xml.element("{music}album")
+        var element = xml.element("root", {}, [
+            xml.element("{music}:album")
         ]);
         assertXmlString(element, {"m": "music"},
             '<root xmlns:m="music"><m:album/></root>');
     });
     
     test('can write child elements with short-form prefix when URI is namespace', function() {
-        var element = xml.element("root", {"m": "music"}, [
+        var element = xml.element("root", {}, [
             xml.element("m:album")
         ]);
         assertXmlString(element, {"m": "music"},
             '<root xmlns:m="music"><m:album/></root>');
     });
+    
+    test('default namespace has key of empty string', function() {
+        var element = xml.element("root", {}, [
+            xml.element("{music}:album")
+        ]);
+        assertXmlString(element, {"": "music"},
+            '<root xmlns="music"><album/></root>');
+    });
 });