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diff --git a/src/DotNetOpenAuth.OpenId/OpenId/Messages/PositiveAssertionResponse.cs b/src/DotNetOpenAuth.OpenId/OpenId/Messages/PositiveAssertionResponse.cs
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+++ b/src/DotNetOpenAuth.OpenId/OpenId/Messages/PositiveAssertionResponse.cs
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+//-----------------------------------------------------------------------
+// <copyright file="PositiveAssertionResponse.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.OpenId.Messages {
+	using System;
+	using System.Collections.Generic;
+	using System.Diagnostics;
+	using System.Globalization;
+	using System.Linq;
+	using System.Net.Security;
+	using System.Text;
+	using DotNetOpenAuth.Messaging;
+	using DotNetOpenAuth.Messaging.Bindings;
+	using DotNetOpenAuth.OpenId.ChannelElements;
+
+	/// <summary>
+	/// An identity assertion from a Provider to a Relying Party, stating that the
+	/// user operating the user agent is in fact some specific user known to the Provider.
+	/// </summary>
+	[DebuggerDisplay("OpenID {Version} {Mode} {LocalIdentifier}")]
+	[Serializable]
+	internal class PositiveAssertionResponse : IndirectSignedResponse {
+		/// <summary>
+		/// Initializes a new instance of the <see cref="PositiveAssertionResponse"/> class.
+		/// </summary>
+		/// <param name="request">
+		/// The authentication request that caused this assertion to be generated.
+		/// </param>
+		internal PositiveAssertionResponse(CheckIdRequest request)
+			: base(request) {
+			this.ClaimedIdentifier = request.ClaimedIdentifier;
+			this.LocalIdentifier = request.LocalIdentifier;
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="PositiveAssertionResponse"/> class
+		/// for unsolicited assertions.
+		/// </summary>
+		/// <param name="version">The OpenID version to use.</param>
+		/// <param name="relyingPartyReturnTo">The return_to URL of the Relying Party.
+		/// This value will commonly be from <see cref="SignedResponseRequest.ReturnTo"/>,
+		/// but for unsolicited assertions may come from the Provider performing RP discovery
+		/// to find the appropriate return_to URL to use.</param>
+		internal PositiveAssertionResponse(Version version, Uri relyingPartyReturnTo)
+			: base(version, relyingPartyReturnTo) {
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="PositiveAssertionResponse"/> class.
+		/// </summary>
+		/// <param name="relyingParty">The relying party return_to endpoint that will receive this positive assertion.</param>
+		internal PositiveAssertionResponse(RelyingPartyEndpointDescription relyingParty)
+			: this(relyingParty.Protocol.Version, relyingParty.ReturnToEndpoint) {
+		}
+
+		/// <summary>
+		/// Gets or sets the Claimed Identifier.
+		/// </summary>
+		/// <remarks>
+		/// <para>"openid.claimed_id" and "openid.identity" SHALL be either both present or both absent. 
+		/// If neither value is present, the assertion is not about an identifier, 
+		/// and will contain other information in its payload, using extensions (Extensions). </para>
+		/// </remarks>
+		[MessagePart("openid.claimed_id", IsRequired = true, AllowEmpty = false, RequiredProtection = ProtectionLevel.Sign, MinVersion = "2.0")]
+		internal Identifier ClaimedIdentifier { get; set; }
+
+		/// <summary>
+		/// Gets or sets the OP Local Identifier.
+		/// </summary>
+		/// <value>The OP-Local Identifier. </value>
+		/// <remarks>
+		/// <para>OpenID Providers MAY assist the end user in selecting the Claimed 
+		/// and OP-Local Identifiers about which the assertion is made. 
+		/// The openid.identity field MAY be omitted if an extension is in use that 
+		/// makes the response meaningful without it (see openid.claimed_id above). </para>
+		/// </remarks>
+		[MessagePart("openid.identity", IsRequired = true, AllowEmpty = false, RequiredProtection = ProtectionLevel.Sign)]
+		internal Identifier LocalIdentifier { get; set; }
+	}
+}