Added the XmlFormatWriter/Reader
diff --git a/src/ProtocolBuffers/Serialization/AbstractTextWriter.cs b/src/ProtocolBuffers/Serialization/AbstractTextWriter.cs
new file mode 100644
index 0000000..75acc0f
--- /dev/null
+++ b/src/ProtocolBuffers/Serialization/AbstractTextWriter.cs
@@ -0,0 +1,73 @@
+using System;
+using System.Xml;
+
+namespace Google.ProtocolBuffers.Serialization
+{
+ /// <summary>
+ /// Provides a base class for text writers
+ /// </summary>
+ public abstract class AbstractTextWriter : AbstractWriter
+ {
+ /// <summary>
+ /// Encodes raw bytes to be written to the stream
+ /// </summary>
+ protected virtual string EncodeBytes(ByteString bytes) { return bytes.ToBase64(); }
+
+ /// <summary>
+ /// Writes a typed field as a text value
+ /// </summary>
+ protected abstract void WriteAsText(string field, string textValue, object typedValue);
+
+ /// <summary>
+ /// Writes a String value
+ /// </summary>
+ protected override void Write(string field, string value) { WriteAsText(field, value, value); }
+
+ /// <summary>
+ /// Writes a Boolean value
+ /// </summary>
+ protected override void Write(string field, bool value) { WriteAsText(field, XmlConvert.ToString(value), value); }
+
+ /// <summary>
+ /// Writes a Int32 value
+ /// </summary>
+ protected override void Write(string field, int value) { WriteAsText(field, XmlConvert.ToString(value), value); }
+
+ /// <summary>
+ /// Writes a UInt32 value
+ /// </summary>
+ [CLSCompliant(false)]
+ protected override void Write(string field, uint value) { WriteAsText(field, XmlConvert.ToString(value), value); }
+
+ /// <summary>
+ /// Writes a Int64 value
+ /// </summary>
+ protected override void Write(string field, long value) { WriteAsText(field, XmlConvert.ToString(value), value); }
+
+ /// <summary>
+ /// Writes a UInt64 value
+ /// </summary>
+ [CLSCompliant(false)]
+ protected override void Write(string field, ulong value) { WriteAsText(field, XmlConvert.ToString(value), value); }
+
+ /// <summary>
+ /// Writes a Single value
+ /// </summary>
+ protected override void Write(string field, float value) { WriteAsText(field, XmlConvert.ToString(value), value); }
+
+ /// <summary>
+ /// Writes a Double value
+ /// </summary>
+ protected override void Write(string field, double value) { WriteAsText(field, XmlConvert.ToString(value), value); }
+
+ /// <summary>
+ /// Writes a set of bytes
+ /// </summary>
+ protected override void Write(string field, ByteString value) { WriteAsText(field, EncodeBytes(value), value); }
+
+ /// <summary>
+ /// Writes a System.Enum by the numeric and textual value
+ /// </summary>
+ protected override void WriteEnum(string field, int number, string name) { WriteAsText(field, name, number); }
+ }
+}
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