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using System;
namespace VersOne.Epub.Schema
{
/// <summary>
/// <para>Represents a language of the content of the EPUB book.</para>
/// <para>
/// See <see href="https://www.w3.org/TR/epub-33/#sec-opf-dclanguage" />,
/// <see href="https://idpf.org/epub/20/spec/OPF_2.0.1_draft.htm#Section2.2.12" />,
/// and <see href="http://purl.org/dc/elements/1.1/language" /> for more information.
/// </para>
/// </summary>
public class EpubMetadataLanguage
{
/// <summary>
/// Initializes a new instance of the <see cref="EpubMetadataLanguage" /> class.
/// </summary>
/// <param name="language">The language tag.</param>
/// <param name="id">The unique ID of this language metadata element or <c>null</c> if the language metadata element doesn't have an ID.</param>
/// <exception cref="ArgumentNullException">The <paramref name="language" /> parameter is <c>null</c>.</exception>
public EpubMetadataLanguage(string language, string? id = null)
{
Language = language ?? throw new ArgumentNullException(nameof(language));
Id = id;
}
/// <summary>
/// <para>Gets the language tag.</para>
/// <para>
/// See <see href="https://www.w3.org/TR/epub-33/#sec-opf-dclanguage" />
/// and <see href="https://www.rfc-editor.org/info/bcp47" /> for more information.
/// </para>
/// </summary>
public string Language { get; }
/// <summary>
/// <para>Gets the unique ID of this language metadata element or <c>null</c> if the language metadata element doesn't have an ID.</para>
/// <para>See <see href="https://www.w3.org/TR/epub-33/#attrdef-id" /> for more information.</para>
/// </summary>
public string? Id { get; }
}
}
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