added extention methods

Source/Svg.csproj

@@ -117,6 +117,7 @@
     <Compile Include="Painting\EnumConverters.cs" />
     <Compile Include="SvgDefinitionDefaults.cs" />
     <Compile Include="SvgElementAttribute.cs" />
+    <Compile Include="SvgExtentions.cs" />
     <Compile Include="SvgRenderer.cs" />
     <Compile Include="Painting\SvgColourConverter.cs" />
     <Compile Include="Painting\SvgGradientSpreadMethod.cs" />

Source/SvgExtentions.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Drawing;
+using System.IO;
+using System.Xml;
+
+namespace Svg
+{
+    /// <summary>
+    /// Svg helpers
+    /// </summary>
+    public static class SvgExtentions
+    {
+        public static void SetRectangle(this SvgRectangle r, RectangleF bounds)
+        {
+            r.X = bounds.X;
+            r.Y = bounds.Y;
+            r.Width = bounds.Width;
+            r.Height = bounds.Height;
+        }
+
+        public static string GetXML(this SvgDocument doc)
+        {
+            var ret = "";
+
+            using (var ms = new MemoryStream())
+            {
+                doc.Write(ms);
+                ms.Position = 0;
+                var sr = new StreamReader(ms);
+                ret = sr.ReadToEnd();
+                sr.Close();
+            }
+
+            return ret;
+        }
+
+        public static string GetXML(this SvgElement elem)
+        {
+            using (StringWriter str = new StringWriter())
+            using (XmlTextWriter xml = new XmlTextWriter(str))
+            {
+                elem.WriteElement(xml);
+                return str.ToString();
+
+            }
+        }
+    }
+}