// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Text.Json.Serialization;
 
namespace Microsoft.Extensions.AI;
 
/// <summary>Describes the portion of an associated <see cref="AIContent"/> to which an annotation applies.</summary>
/// <remarks>
/// Details about the region is provided by derived types based on how the region is described. For example, starting
/// and ending indices into text content are provided by <see cref="TextSpanAnnotatedRegion"/>.
/// </remarks>
[JsonPolymorphic(TypeDiscriminatorPropertyName = "$type")]
[JsonDerivedType(typeof(TextSpanAnnotatedRegion), typeDiscriminator: "textSpan")]
public class AnnotatedRegion
{
    /// <summary>
    /// Initializes a new instance of the <see cref="AnnotatedRegion"/> class.
    /// </summary>
    public AnnotatedRegion()
    {
    }
}