* added preserverAspectRatio attribute

Source/DataTypes/ISvgViewPort.cs

@@ -14,5 +14,6 @@ namespace Svg
         /// Gets or sets the viewport of the element.
         /// </summary>
         SvgViewBox ViewBox { get; set; }
+        SvgAspectRatio AspectRatio { get; set; }
     }
 }

Source/DataTypes/SvgAspectRatio.cs

+using System;
+using System.ComponentModel;
+
+namespace Svg
+{
+	/// <summary>
+	/// Description of SvgAspectRatio.
+	/// </summary>
+	public class SvgAspectRatio
+	{
+		public SvgAspectRatio()
+		{
+		}
+		
+		public SvgAspectRatio(SvgPreserveAspectRatio align)
+			: this(align, false)
+		{
+		}
+		
+		public SvgAspectRatio(SvgPreserveAspectRatio align, bool slice)
+		{
+			this.Align = align;
+			this.Slice = slice;
+		}
+		
+		public SvgPreserveAspectRatio Align
+		{
+			get;
+			set;
+		}
+		
+		public bool Slice
+		{
+			get;
+			set;
+		}
+		
+		public override string ToString()
+		{
+			return TypeDescriptor.GetConverter(typeof(SvgPreserveAspectRatio)).ConvertToString(this.Align) + (Slice ? " slice" : "");
+		}
+
+	}
+	
+	[TypeConverter(typeof(SvgPreserverAspectRatioConverter))]
+	public enum SvgPreserveAspectRatio
+	{
+		XMidYMid, //default
+		None,
+		XMinYMin,
+		XMidYMin,
+		XMaxYMin,
+		XMinYMid,
+		XMaxYMid,
+		XMinYMax,
+		XMidYMax,
+		XMaxYMax
+	}
+}

Source/Document Structure/SvgFragment.cs

@@ -17,6 +17,7 @@ namespace Svg
         private SvgUnit _width;
         private SvgUnit _height;
         private SvgViewBox _viewBox;
+        private SvgAspectRatio _aspect;
 
         /// <summary>
         /// Gets the SVG namespace string.
@@ -55,6 +56,17 @@ namespace Svg
             get { return this._viewBox; }
             set { this._viewBox = value; }
         }
+        
+        /// <summary>
+        /// Gets or sets the aspect of the viewport.
+        /// </summary>
+        /// <value></value>
+        [SvgAttribute("preserveAspectRatio")]
+        public SvgAspectRatio AspectRatio
+        {
+            get { return this._aspect; }
+            set { this._aspect = value; }
+        }
 
         /// <summary>
         /// Applies the required transforms to <see cref="SvgRenderer"/>.
@@ -109,6 +121,7 @@ namespace Svg
             this._height = new SvgUnit(SvgUnitType.Percentage, 100.0f);
             this._width = new SvgUnit(SvgUnitType.Percentage, 100.0f);
             this.ViewBox = SvgViewBox.Empty;
+            this.AspectRatio = new SvgAspectRatio(SvgPreserveAspectRatio.None);
         }
     }
 }
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