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using System;
namespace VersOne.Epub.Schema
{
/// <summary>
/// <para>An identifier associated with the EPUB book, such as a UUID, DOI, or ISBN.</para>
/// <para>
/// See <see href="https://www.w3.org/TR/epub-33/#sec-opf-dcidentifier" />,
/// <see href="https://idpf.org/epub/20/spec/OPF_2.0.1_draft.htm#Section2.2.10" />,
/// and <see href="http://purl.org/dc/elements/1.1/identifier" /> for more information.
/// </para>
/// </summary>
public class EpubMetadataIdentifier
{
/// <summary>
/// Initializes a new instance of the <see cref="EpubMetadataIdentifier" /> class.
/// </summary>
/// <param name="identifier">The unambiguous identifier for the EPUB book.</param>
/// <param name="id">The unique ID of this EPUB metadata identifier item or <c>null</c> if the metadata identifier doesn't have an ID.</param>
/// <param name="scheme">
/// The name of the system or authority that generated or assigned the identifier, for example 'ISBN' or 'DOI' or <c>null</c> if the identified doesn't have a scheme.
/// </param>
/// <exception cref="ArgumentNullException">The <paramref name="identifier" /> parameter is <c>null</c>.</exception>
public EpubMetadataIdentifier(string identifier, string? id = null, string? scheme = null)
{
Identifier = identifier ?? throw new ArgumentNullException(nameof(identifier));
Id = id;
Scheme = scheme;
}
/// <summary>
/// <para>Gets the unambiguous identifier for the EPUB book.</para>
/// <para>See <see href="https://www.w3.org/TR/epub-33/#sec-opf-dcidentifier" /> for more information.</para>
/// </summary>
public string Identifier { get; }
/// <summary>
/// <para>Gets the unique ID of this EPUB metadata identifier item or <c>null</c> if the metadata identifier 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; }
/// <summary>
/// <para>
/// Gets the name of the system or authority that generated or assigned the identifier, for example 'ISBN' or 'DOI' or <c>null</c> if the identified doesn't have a scheme.
/// </para>
/// <para>See <see href="https://idpf.org/epub/20/spec/OPF_2.0.1_draft.htm#Section2.2.10" /> for more information.</para>
/// </summary>
public string? Scheme { get; }
}
}
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