[gxml] XParser: write element defuault xmlns

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit f85f1cf026826b37138bdaf9e62b963f0230abd7
Author: Daniel Espinosa <esodan gmail com>
Date:   Thu Nov 3 13:14:44 2016 -0600

    XParser: write element defuault xmlns
    
    If element has a namespace defined but no prefix
    parser adds its namespace definition

 gxml/GomDocument.vala     |    2 +-
 gxml/XParser.vala         |    7 +++++++
 test/GomDocumentTest.vala |   15 +++++++++++++++
 3 files changed, 23 insertions(+), 1 deletions(-)
---
diff --git a/gxml/GomDocument.vala b/gxml/GomDocument.vala
index 8f36b00..a0c0c4b 100644
--- a/gxml/GomDocument.vala
+++ b/gxml/GomDocument.vala
@@ -113,7 +113,7 @@ public class GXml.GomDocument : GomNode,
   public DomElement create_element_ns (string? namespace_uri, string qualified_name) throws GLib.Error
   {
     string n = "";
-    string nsp = "";
+    string nsp = null;
     if (":" in qualified_name) {
       var s = qualified_name.split (":");
       if (s.length != 2)
diff --git a/gxml/XParser.vala b/gxml/XParser.vala
index 95e8253..737798b 100644
--- a/gxml/XParser.vala
+++ b/gxml/XParser.vala
@@ -346,6 +346,13 @@ public class GXml.XParser : Object, GXml.Parser {
         string name = (node as DomElement).prefix
                       + ":" + (node as DomElement).local_name;
         tw.start_element (name);
+      }
+      if ((node as DomElement).prefix == null
+            && (node as DomElement).namespace_uri != null) {
+            GLib.message ("Writting namespace definition for node");
+          tw.start_element_ns (null,
+                               (node as DomElement).local_name,
+                               (node as DomElement).namespace_uri);
       } else
         tw.start_element (node.node_name);
     GLib.message ("Write down properties: size:"+(node as DomElement).attributes.size.to_string ());
diff --git a/test/GomDocumentTest.vala b/test/GomDocumentTest.vala
index 01393fb..5b66b77 100644
--- a/test/GomDocumentTest.vala
+++ b/test/GomDocumentTest.vala
@@ -149,6 +149,21 @@ class GomDocumentTest : GXmlTest {
                                assert_not_reached ();
                        }
                });
+               Test.add_func ("/gxml/gom-document/namespace/write", () => {
+                       try {
+                               var doc = new GomDocument ();
+                               var r = doc.create_element_ns ("http://live.gnome.org/GXml","root";);
+                               doc.append_child (r);
+                               assert (r.prefix == null);
+                               assert (r.namespace_uri == "http://live.gnome.org/GXml";);
+                               string s = doc.to_string ();
+                               GLib.message (@"DOC: "+s);
+                               assert ("<root xmlns=\"http://live.gnome.org/GXml\"/>" in s);
+                       } catch (GLib.Error e) {
+                               GLib.message ("Error: "+e.message);
+                               assert_not_reached ();
+                       }
+               });
                Test.add_func ("/gxml/gom-document/construct_from_stream_error", () => {
                                File fin;
                                InputStream instream;