Создание помеченного PDF с использованием C#

Создание помеченного PDF означает добавление (или создание) определенных элементов в документ, которые позволят документу быть проверенным в соответствии с требованиями PDF/UA. Эти элементы часто называются элементами структуры.

Следующий фрагмент кода также работает с библиотекой Aspose.PDF.Drawing.

Создание помеченного PDF (Простой сценарий)

Для создания элементов структуры в помеченном PDF документе Aspose.PDF предлагает методы для создания элементов структуры с использованием интерфейса ITaggedContent. Следующий фрагмент кода показывает, как создать помеченный PDF, который содержит 2 элемента: заголовок и абзац.

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void CreateTaggedPdfDocument01()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Create PDF document
    using (var document = new Aspose.Pdf.Document())
    {
        // Get Content for work with TaggedPdf
        Aspose.Pdf.Tagged.ITaggedContent taggedContent = document.TaggedContent;
        var rootElement = taggedContent.RootElement;

        // Set Title and Language for Document
        taggedContent.SetTitle("Tagged Pdf Document");
        taggedContent.SetLanguage("en-US");

        Aspose.Pdf.LogicalStructure.HeaderElement mainHeader = taggedContent.CreateHeaderElement();
        mainHeader.SetText("Main Header");

        Aspose.Pdf.LogicalStructure.ParagraphElement paragraphElement = taggedContent.CreateParagraphElement();
        paragraphElement.SetText("Lorem ipsum dolor sit amet, consectetur adipiscing elit. " +
            "Aenean nec lectus ac sem faucibus imperdiet. Sed ut erat ac magna ullamcorper hendrerit. " +
            "Cras pellentesque libero semper, gravida magna sed, luctus leo. Fusce lectus odio, laoreet" +
            "nec ullamcorper ut, molestie eu elit. Interdum et malesuada fames ac ante ipsum primis in faucibus." +
            "Aliquam lacinia sit amet elit ac consectetur. Donec cursus condimentum ligula, vitae volutpat" +
            "sem tristique eget. Nulla in consectetur massa. Vestibulum vitae lobortis ante. Nulla ullamcorper" +
            "pellentesque justo rhoncus accumsan. Mauris ornare eu odio non lacinia. Aliquam massa leo, rhoncus" +
            "ac iaculis eget, tempus et magna. Sed non consectetur elit. Sed vulputate, quam sed lacinia luctus," +
            "ipsum nibh fringilla purus, vitae posuere risus odio id massa. Cras sed venenatis lacus.");

        rootElement.AppendChild(mainHeader);
        rootElement.AppendChild(paragraphElement);

        // Save Tagged PDF Document
        document.Save(dataDir + "TaggedPdfDocument_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void CreateTaggedPdfDocument01()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Create PDF Document
    using var document = new Aspose.Pdf.Document();

    // Get Content for work with TaggedPdf
    Aspose.Pdf.Tagged.ITaggedContent taggedContent = document.TaggedContent;
    var rootElement = taggedContent.RootElement;

    // Set Title and Language for Document
    taggedContent.SetTitle("Tagged Pdf Document");
    taggedContent.SetLanguage("en-US");

    Aspose.Pdf.LogicalStructure.HeaderElement mainHeader = taggedContent.CreateHeaderElement();
    mainHeader.SetText("Main Header");

    Aspose.Pdf.LogicalStructure.ParagraphElement paragraphElement = taggedContent.CreateParagraphElement();
    paragraphElement.SetText("Lorem ipsum dolor sit amet, consectetur adipiscing elit. " +
        "Aenean nec lectus ac sem faucibus imperdiet. Sed ut erat ac magna ullamcorper hendrerit. " +
        "Cras pellentesque libero semper, gravida magna sed, luctus leo. Fusce lectus odio, laoreet" +
        "nec ullamcorper ut, molestie eu elit. Interdum et malesuada fames ac ante ipsum primis in faucibus." +
        "Aliquam lacinia sit amet elit ac consectetur. Donec cursus condimentum ligula, vitae volutpat" +
        "sem tristique eget. Nulla in consectetur massa. Vestibulum vitae lobortis ante. Nulla ullamcorper" +
        "pellentesque justo rhoncus accumsan. Mauris ornare eu odio non lacinia. Aliquam massa leo, rhoncus" +
        "ac iaculis eget, tempus et magna. Sed non consectetur elit. Sed vulputate, quam sed lacinia luctus," +
        "ipsum nibh fringilla purus, vitae posuere risus odio id massa. Cras sed venenatis lacus.");

    rootElement.AppendChild(mainHeader);
    rootElement.AppendChild(paragraphElement);

    // Save Tagged PDF Document
    document.Save(dataDir + "TaggedPdfDocument_out.pdf");
}

Мы получим следующий документ после создания:

Создание помеченного PDF с вложенными элементами (Создание дерева элементов структуры)

В некоторых случаях нам нужно создать более сложную структуру, например, разместить цитаты в абзаце. Для создания дерева элементов структуры мы должны использовать метод AppendChild. Следующий фрагмент кода показывает, как создать дерево элементов структуры помеченного PDF документа:

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void CreateTaggedPdfDocument02()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Create PDF Document
    using (var document = new Aspose.Pdf.Document())
    {
        // Get Content for work with TaggedPdf
        Aspose.Pdf.Tagged.ITaggedContent taggedContent = document.TaggedContent;
        var rootElement = taggedContent.RootElement;

        // Set Title and Language for Document
        taggedContent.SetTitle("Tagged Pdf Document");
        taggedContent.SetLanguage("en-US");

        Aspose.Pdf.LogicalStructure.HeaderElement header1 = taggedContent.CreateHeaderElement(1);
        header1.SetText("Header Level 1");

        Aspose.Pdf.LogicalStructure.ParagraphElement paragraphWithQuotes = taggedContent.CreateParagraphElement();
        paragraphWithQuotes.StructureTextState.Font = Aspose.Pdf.Text.FontRepository.FindFont("Calibri");
        paragraphWithQuotes.AdjustPosition(new Aspose.Pdf.Tagged.PositionSettings
            {
                Margin = new Aspose.Pdf.MarginInfo(10, 5, 10, 5)
            });

        Aspose.Pdf.LogicalStructure.SpanElement spanElement1 = taggedContent.CreateSpanElement();
        spanElement1.SetText("Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean nec lectus ac sem faucibus imperdiet. Sed ut erat ac magna ullamcorper hendrerit. Cras pellentesque libero semper, gravida magna sed, luctus leo. Fusce lectus odio, laoreet nec ullamcorper ut, molestie eu elit. Interdum et malesuada fames ac ante ipsum primis in faucibus. Aliquam lacinia sit amet elit ac consectetur. Donec cursus condimentum ligula, vitae volutpat sem tristique eget. Nulla in consectetur massa. Vestibulum vitae lobortis ante. Nulla ullamcorper pellentesque justo rhoncus accumsan. Mauris ornare eu odio non lacinia. Aliquam massa leo, rhoncus ac iaculis eget, tempus et magna. Sed non consectetur elit. ");

        Aspose.Pdf.LogicalStructure.QuoteElement quoteElement = taggedContent.CreateQuoteElement();
        quoteElement.SetText("Sed vulputate, quam sed lacinia luctus, ipsum nibh fringilla purus, vitae posuere risus odio id massa.");
        quoteElement.StructureTextState.FontStyle = Aspose.Pdf.Text.FontStyles.Bold | Aspose.Pdf.Text.FontStyles.Italic;
        Aspose.Pdf.LogicalStructure.SpanElement spanElement2 = taggedContent.CreateSpanElement();
        spanElement2.SetText(" Sed non consectetur elit.");

        paragraphWithQuotes.AppendChild(spanElement1);
        paragraphWithQuotes.AppendChild(quoteElement);
        paragraphWithQuotes.AppendChild(spanElement2);

        rootElement.AppendChild(header1);
        rootElement.AppendChild(paragraphWithQuotes);

        // Save Tagged PDF Document
        document.Save(dataDir + "TaggedPdfDocument_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void CreateTaggedPdfDocument02()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Create PDF Document
    using var document = new Aspose.Pdf.Document();

    // Get Content for work with TaggedPdf
    Aspose.Pdf.Tagged.ITaggedContent taggedContent = document.TaggedContent;
    var rootElement = taggedContent.RootElement;

    // Set Title and Language for Document
    taggedContent.SetTitle("Tagged Pdf Document");
    taggedContent.SetLanguage("en-US");

    Aspose.Pdf.LogicalStructure.HeaderElement header1 = taggedContent.CreateHeaderElement(1);
    header1.SetText("Header Level 1");

    Aspose.Pdf.LogicalStructure.ParagraphElement paragraphWithQuotes = taggedContent.CreateParagraphElement();
    paragraphWithQuotes.StructureTextState.Font = Aspose.Pdf.Text.FontRepository.FindFont("Calibri");
    
    paragraphWithQuotes.AdjustPosition(new Aspose.Pdf.Tagged.PositionSettings
        {
            Margin = new Aspose.Pdf.MarginInfo(10, 5, 10, 5)
        });

    Aspose.Pdf.LogicalStructure.SpanElement spanElement1 = taggedContent.CreateSpanElement();
    spanElement1.SetText("Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean nec lectus ac sem faucibus imperdiet. Sed ut erat ac magna ullamcorper hendrerit. Cras pellentesque libero semper, gravida magna sed, luctus leo. Fusce lectus odio, laoreet nec ullamcorper ut, molestie eu elit. Interdum et malesuada fames ac ante ipsum primis in faucibus. Aliquam lacinia sit amet elit ac consectetur. Donec cursus condimentum ligula, vitae volutpat sem tristique eget. Nulla in consectetur massa. Vestibulum vitae lobortis ante. Nulla ullamcorper pellentesque justo rhoncus accumsan. Mauris ornare eu odio non lacinia. Aliquam massa leo, rhoncus ac iaculis eget, tempus et magna. Sed non consectetur elit. ");

    Aspose.Pdf.LogicalStructure.QuoteElement quoteElement = taggedContent.CreateQuoteElement();
    quoteElement.SetText("Sed vulputate, quam sed lacinia luctus, ipsum nibh fringilla purus, vitae posuere risus odio id massa.");
    quoteElement.StructureTextState.FontStyle = Aspose.Pdf.Text.FontStyles.Bold | Aspose.Pdf.Text.FontStyles.Italic;
    Aspose.Pdf.LogicalStructure.SpanElement spanElement2 = taggedContent.CreateSpanElement();
    spanElement2.SetText(" Sed non consectetur elit.");

    paragraphWithQuotes.AppendChild(spanElement1);
    paragraphWithQuotes.AppendChild(quoteElement);
    paragraphWithQuotes.AppendChild(spanElement2);

    rootElement.AppendChild(header1);
    rootElement.AppendChild(paragraphWithQuotes);

    // Save Tagged PDF Document
    document.Save(dataDir + "TaggedPdfDocument_out.pdf");
}

Мы получим следующий документ после создания:

Стилизация структуры текста

Для стилизации структуры текста в помеченном PDF документе Aspose.PDF предлагает свойства Font, FontSize, FontStyle и ForegroundColor класса StructureTextState. Следующий фрагмент кода показывает, как стилизовать структуру текста в помеченном PDF документе:

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void AddStyle()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Create PDF Document
    using (var document = new Aspose.Pdf.Document())
    {
        // Get Content for work with TaggedPdf
        Aspose.Pdf.Tagged.ITaggedContent taggedContent = document.TaggedContent;

        // Set Title and Language for Document
        taggedContent.SetTitle("Tagged Pdf Document");
        taggedContent.SetLanguage("en-US");

        Aspose.Pdf.LogicalStructure.ParagraphElement p = taggedContent.CreateParagraphElement();
        taggedContent.RootElement.AppendChild(p);

        p.StructureTextState.FontSize = 18F;
        p.StructureTextState.ForegroundColor = Aspose.Pdf.Color.Red;
        p.StructureTextState.FontStyle = Aspose.Pdf.Text.FontStyles.Italic;

        p.SetText("Red italic text.");

        // Save Tagged PDF Document
        document.Save(dataDir + "StyleTextStructure_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void AddStyle()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Create PDF Document
    using var document = new Aspose.Pdf.Document();

    // Get Content for work with TaggedPdf
    Aspose.Pdf.Tagged.ITaggedContent taggedContent = document.TaggedContent;

    // Set Title and Language for Document
    taggedContent.SetTitle("Tagged Pdf Document");
    taggedContent.SetLanguage("en-US");

    Aspose.Pdf.LogicalStructure.ParagraphElement p = taggedContent.CreateParagraphElement();
    taggedContent.RootElement.AppendChild(p);

    p.StructureTextState.FontSize = 18F;
    p.StructureTextState.ForegroundColor = Aspose.Pdf.Color.Red;
    p.StructureTextState.FontStyle = Aspose.Pdf.Text.FontStyles.Italic;

    p.SetText("Red italic text.");

    // Save Tagged PDF Document
    document.Save(dataDir + "StyleTextStructure_out.pdf");
}

Иллюстрация элементов структуры

Для иллюстрации элементов структуры в помеченном PDF документе Aspose.PDF предлагает класс IllustrationElement. Следующий фрагмент кода показывает, как иллюстрировать элементы структуры в помеченном PDF документе:

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void IllustrateStructureElements()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Create PDF Document
    using (var document = new Aspose.Pdf.Document())
    {
        // Get Content for work with TaggedPdf
        Aspose.Pdf.Tagged.ITaggedContent taggedContent = document.TaggedContent;

        // Set Title and Language for Document
        taggedContent.SetTitle("Tagged Pdf Document");
        taggedContent.SetLanguage("en-US");

        Aspose.Pdf.LogicalStructure.IllustrationElement figure1 = taggedContent.CreateFigureElement();
        taggedContent.RootElement.AppendChild(figure1);
        figure1.AlternativeText = "Figure One";
        figure1.Title = "Image 1";
        figure1.SetTag("Fig1");
        figure1.SetImage(dataDir + "image.png");
        
        // Adjust position
        figure1.AdjustPosition(new Aspose.Pdf.Tagged.PositionSettings
        {
            Margin = new Aspose.Pdf.MarginInfo
            {
                Left = 50,
                Top = 20
            },
        });

        // Save Tagged PDF Document
        document.Save(dataDir + "IllustrationStructureElements_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void IllustrateStructureElements()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Create PDF Document
    using var document = new Aspose.Pdf.Document();

    // Get Content for work with TaggedPdf
    Aspose.Pdf.Tagged.ITaggedContent taggedContent = document.TaggedContent;

    // Set Title and Language for Document
    taggedContent.SetTitle("Tagged Pdf Document");
    taggedContent.SetLanguage("en-US");

    Aspose.Pdf.LogicalStructure.IllustrationElement figure1 = taggedContent.CreateFigureElement();
    taggedContent.RootElement.AppendChild(figure1);
    figure1.AlternativeText = "Figure One";
    figure1.Title = "Image 1";
    figure1.SetTag("Fig1");
    figure1.SetImage(dataDir + "image.png");
    
    // Adjust position
    figure1.AdjustPosition(new Aspose.Pdf.Tagged.PositionSettings
    {
        Margin = new Aspose.Pdf.MarginInfo
        {
            Left = 50,
            Top = 20
        },
    });

    // Save Tagged PDF Document
    document.Save(dataDir + "IllustrationStructureElements_out.pdf");
}

Проверка помеченного PDF

Aspose.PDF for .NET предоставляет возможность проверять документ PDF/UA помеченного PDF. Валидация стандарта PDF/UA поддерживает:

• Проверки на XObjects.
• Проверки на действия.
• Проверки на необязательный контент.
• Проверки на встроенные файлы.
• Проверки на поля Acroform (Проверка естественного языка и альтернативного имени и цифровых подписей).
• Проверки на поля формы XFA.
• Проверки на настройки безопасности.
• Проверки на навигацию.
• Проверки на аннотации.

Ниже приведен фрагмент кода, который показывает, как проверить помеченный PDF документ. Соответствующие проблемы будут отображены в XML отчете.

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ValidateTaggedPdf()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Open PDF document
    using (var document = new Aspose.Pdf.Document(dataDir + "StructureElements.pdf"))
    {
        bool isValid = document.Validate(dataDir + "StructureElements_log.xml", Aspose.Pdf.PdfFormat.PDF_UA_1);
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ValidateTaggedPdf()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Open PDF document
    using var document = new Aspose.Pdf.Document(dataDir + "StructureElements.pdf");

    bool isValid = document.Validate(dataDir + "StructureElements_log.xml", Aspose.Pdf.PdfFormat.PDF_UA_1);
}

Настройка позиции структуры текста

Следующий фрагмент кода показывает, как настроить позицию структуры текста в помеченном PDF документе:

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void AdjustPosition()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Create PDF Document
    using (var document = new Aspose.Pdf.Document())
    {
        // Get Content for work with TaggedPdf
        var taggedContent = document.TaggedContent;

        // Set Title and Language for Document
        taggedContent.SetTitle("Tagged Pdf Document");
        taggedContent.SetLanguage("en-US");

        // Create paragraph
        var p = taggedContent.CreateParagraphElement();
        taggedContent.RootElement.AppendChild(p);
        p.SetText("Text.");

        // Adjust position
        p.AdjustPosition(new Aspose.Pdf.Tagged.PositionSettings
        {
            HorizontalAlignment = Aspose.Pdf.HorizontalAlignment.None,
            Margin = new Aspose.Pdf.MarginInfo
            {
                Left = 300,
                Right = 0,
                Top = 20,
                Bottom = 0
            },
            VerticalAlignment = Aspose.Pdf.VerticalAlignment.None,
            IsFirstParagraphInColumn = false,
            IsKeptWithNext = false,
            IsInNewPage = false,
            IsInLineParagraph = false
        });

        // Save Tagged PDF Document
        document.Save(dataDir + "AdjustTextPosition_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void AdjustPosition()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Create PDF Document
    using var document = new Aspose.Pdf.Document();
    
    // Get Content for work with TaggedPdf
    var taggedContent = document.TaggedContent;

    // Set Title and Language for Document
    taggedContent.SetTitle("Tagged Pdf Document");
    taggedContent.SetLanguage("en-US");

    // Create paragraph
    var p = taggedContent.CreateParagraphElement();
    taggedContent.RootElement.AppendChild(p);
    p.SetText("Text.");

    // Adjust position
    p.AdjustPosition(new Aspose.Pdf.Tagged.PositionSettings
    {
        HorizontalAlignment = Aspose.Pdf.HorizontalAlignment.None,
        Margin = new Aspose.Pdf.MarginInfo
        {
            Left = 300,
            Right = 0,
            Top = 20,
            Bottom = 0
        },
        VerticalAlignment = Aspose.Pdf.VerticalAlignment.None,
        IsFirstParagraphInColumn = false,
        IsKeptWithNext = false,
        IsInNewPage = false,
        IsInLineParagraph = false
    });

    // Save Tagged PDF Document
    document.Save(dataDir + "AdjustTextPosition_out.pdf");
}

Автоматическое создание помеченного PDF с конвертацией в PDF/UA-1

Aspose.PDF позволяет автоматически генерировать базовую разметку логической структуры при конвертации документа в PDF/UA-1. Пользователи могут затем вручную улучшить эту базовую логическую структуру, предоставляя дополнительные сведения о содержимом документа.

Чтобы сгенерировать логическую структуру документа, создайте экземпляр класса Aspose.Pdf.AutoTaggingSettings, установите его свойство AutoTaggingSettings.EnableAutoTagging в true и присвойте его свойству PdfFormatConversionOptions.AutoTaggingSettings.

Если документ уже имеет теги логической структуры, включение автоматического тегирования уничтожит существующую логическую структуру и создаст новую.

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ConvertToPdfUAWithAutomaticTagging()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Open PDF document
    using (Aspose.Pdf.Document document = new Aspose.Pdf.Document(dataDir + "BreakfastMenu.pdf"))
    {
        // Create conversion options
        Aspose.Pdf.PdfFormatConversionOptions options = new Aspose.Pdf.PdfFormatConversionOptions(dataDir + "ConvertToPdfUAWithAutomaticTagging.xml", PdfFormat.PDF_UA_1, ConvertErrorAction.Delete);

        // Create auto-tagging settings
        // Aspose.Pdf.AutoTaggingSettings.Default may be used to set the same settings as given below
        Aspose.Pdf.AutoTaggingSettings autoTaggingSettings = new Aspose.Pdf.AutoTaggingSettings();

        // Enable auto-tagging during the conversion process
        autoTaggingSettings.EnableAutoTagging = true;

        // Use the heading recognition strategy that's optimal for the given document structure
        autoTaggingSettings.HeadingRecognitionStrategy = Aspose.Pdf.HeadingRecognitionStrategy.Auto;

        // Assign auto-tagging settings to be used during the conversion process
        options.AutoTaggingSettings = autoTaggingSettings;

        // During the conversion, the document logical structure will be automatically created
        document.Convert(options);

        // Save PDF document
        document.Save(dataDir + "ConvertToPdfUAWithAutomaticTagging_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ConvertToPdfUAWithAutomaticTagging()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Open PDF document
    using Aspose.Pdf.Document document = new Aspose.Pdf.Document(dataDir + "BreakfastMenu.pdf");

    // Create conversion options
    Aspose.Pdf.PdfFormatConversionOptions options = new Aspose.Pdf.PdfFormatConversionOptions(dataDir + "ConvertToPdfUAWithAutomaticTagging.xml", PdfFormat.PDF_UA_1, ConvertErrorAction.Delete);

    // Create auto-tagging settings
    // Aspose.Pdf.AutoTaggingSettings.Default may be used to set the same settings as given below
    Aspose.Pdf.AutoTaggingSettings autoTaggingSettings = new Aspose.Pdf.AutoTaggingSettings
    {
        // Enable auto-tagging during the conversion process
        EnableAutoTagging = true,

        // Use the heading recognition strategy that's optimal for the given document structure
        HeadingRecognitionStrategy = Aspose.Pdf.HeadingRecognitionStrategy.Auto
    };

    // Assign auto-tagging settings to be used during the conversion process
    options.AutoTaggingSettings = autoTaggingSettings;

    // During the conversion, the document logical structure will be automatically created
    document.Convert(options);

    // Save PDF document
    document.Save(dataDir + "ConvertToPdfUAWithAutomaticTagging_out.pdf");
}

Создание помеченного PDF с полями формы

Вы можете пометить интерактивные поля формы в PDF документе, чтобы гарантировать, что они включены в дерево логической структуры для доступности (PDF/UA). Приведенный ниже фрагмент демонстрирует, как создать поле формы, зарегистрировать его в AcroForm и связать его с элементом структуры /Form в дереве структуры.

.NET Core 3.1

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void CreatePdfWithTaggedFormField()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Create PDF document
    using (var document = new Aspose.Pdf.Document())
    {
        document.Pages.Add();
        
        // Get Content for work with TaggedPdf
        Aspose.Pdf.Tagged.ITaggedContent taggedContent = document.TaggedContent;
        Aspose.Pdf.LogicalStructure.StructureElement rootElement = taggedContent.RootElement;

        // Create a visible signature form field (AcroForm)
        var signatureField = new Aspose.Pdf.Forms.SignatureField(document.Pages[1], new Aspose.Pdf.Rectangle(50, 50, 100, 100));
        signatureField.PartialName = "Signature1";
        signatureField.AlternateName = "signature 1";
        
        // Add the signature field to the document's AcroForm
        document.Form.Add(signatureField);

        // Create a /Form structure element in the tag tree
        Aspose.Pdf.LogicalStructure.FormElement form = taggedContent.CreateFormElement();
        form.AlternativeText = "form 1";
        
        // Link the /Form tag to the signature field via an /OBJR reference
        form.Tag(signatureField);
        
        // Add the /Form structure element to the document’s logical structure tree
        rootElement.AppendChild(form);

        // Save PDF document
        document.Save(dataDir + "CreatePdfWithTaggedFormField_out.pdf");
    }
}

.NET 8

// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void CreatePdfWithTaggedFormField()
{
    // The path to the documents directory
    var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

    // Create PDF document
    using var document = new Aspose.Pdf.Document();
    
    document.Pages.Add();
    
    // Get Content for work with TaggedPdf
    Aspose.Pdf.Tagged.ITaggedContent taggedContent = document.TaggedContent;
    Aspose.Pdf.LogicalStructure.StructureElement rootElement = taggedContent.RootElement;

    // Create a visible signature form field (AcroForm)
    var signatureField = new Aspose.Pdf.Forms.SignatureField(document.Pages[1], new Aspose.Pdf.Rectangle(50, 50, 100, 100));
    signatureField.PartialName = "Signature1";
    signatureField.AlternateName = "signature 1";
    
    // Add the signature field to the document's AcroForm
    document.Form.Add(signatureField);

    // Create a /Form structure element in the tag tree
    Aspose.Pdf.LogicalStructure.FormElement form = taggedContent.CreateFormElement();
    form.AlternativeText = "form 1";
    
    // Link the /Form tag to the signature field via an /OBJR reference
    form.Tag(signatureField);
    
    // Add the /Form structure element to the document’s logical structure tree
    rootElement.AppendChild(form);

    // Save PDF document
    document.Save(dataDir + "CreatePdfWithTaggedFormField_out.pdf");
}

Создание помеченного PDF с страницей оглавления (TOC)

Сгенерируйте помеченный PDF документ с доступной страницей оглавления (TOC).

.NET Core 3.1

    // For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
    private static void CreatePdfWithTOCpage()
    {
        // The path to the documents directory
        var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();
    
        // Create PDF document
        using (var doc = new Aspose.Pdf.Document())
        {
            // Get tagged content for the PDF structure
            Aspose.Pdf.Tagged.ITaggedContent content = doc.TaggedContent;
            Aspose.Pdf.LogicalStructure.StructureElement rootElement = content.RootElement;
            content.SetLanguage("en-US");
    
            // Add the table of contents (TOC) page
            Aspose.Pdf.Page tocPage = doc.Pages.Add();
            tocPage.TocInfo = new Aspose.Pdf.TocInfo();
    
            // Create a TOC structure element
            Aspose.Pdf.LogicalStructure.TOCElement tocElement = content.CreateTOCElement();
    
            // Add the TOC element to the document structure tree
            rootElement.AppendChild(tocElement);
    
            // Add a content page
            doc.Pages.Add();
    
            // Create a header element and set its text
            Aspose.Pdf.LogicalStructure.HeaderElement header = content.CreateHeaderElement(1);
            header.SetText("1. Header");
    
            // Add the header to the document structure
            rootElement.AppendChild(header);
    
            // Create a TOC item (TOCI) element
            Aspose.Pdf.LogicalStructure.TOCIElement toci = content.CreateTOCIElement();
    
            // Add the TOCI element to the TOC element
            tocElement.AppendChild(toci);
    
            // Add an entry to the TOC page and link it to the TOCI element
            header.AddEntryToTocPage(tocPage, toci);
    
            // Add a logical reference to the header within the TOCI element
            toci.AddRef(header);
    
            // Save PDF document
            doc.Save(dataDir + "CreatePdfWithTOCpage_out.pdf");
        }
    }

.NET 8

    // For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
    private static void CreatePdfWithTOCpage()
    {
        // The path to the documents directory
        var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();
    
        // Create PDF document
        using var doc = new Aspose.Pdf.Document();
        
        // Get tagged content for the PDF structure
        Aspose.Pdf.Tagged.ITaggedContent content = doc.TaggedContent;
        Aspose.Pdf.LogicalStructure.StructureElement rootElement = content.RootElement;
        content.SetLanguage("en-US");
    
        // Add the table of contents (TOC) page
        Aspose.Pdf.Page tocPage = doc.Pages.Add();
        tocPage.TocInfo = new Aspose.Pdf.TocInfo();
    
        // Create a TOC structure element
        Aspose.Pdf.LogicalStructure.TOCElement tocElement = content.CreateTOCElement();
    
        // Add the TOC element to the document structure tree
        rootElement.AppendChild(tocElement);
    
        // Add a content page
        doc.Pages.Add();
    
        // Create a header element and set its text
        Aspose.Pdf.LogicalStructure.HeaderElement header = content.CreateHeaderElement(1);
        header.SetText("1. Header");
    
        // Add the header to the document structure
        rootElement.AppendChild(header);
    
        // Create a TOC item (TOCI) element
        Aspose.Pdf.LogicalStructure.TOCIElement toci = content.CreateTOCIElement();
    
        // Add the TOCI element to the TOC element
        tocElement.AppendChild(toci);
    
        // Add an entry to the TOC page and link it to the TOCI element
        header.AddEntryToTocPage(tocPage, toci);
    
        // Add a logical reference to the header within the TOCI element
        toci.AddRef(header);
    
        // Save PDF document
        doc.Save(dataDir + "CreatePdfWithTOCpage_out.pdf");
    }

Сгенерируйте помеченный PDF, который включает доступную страницу оглавления, содержащую заголовок страницы и вложенный подсписок.

.NET Core 3.1

    // For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
    private static void CreatePdfWithTOCpageAdvanced()
    {
        // The path to the documents directory
        var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();
    
        // Create PDF document
        using (var doc = new Aspose.Pdf.Document())
        {
            // Get tagged content for the PDF structure
            Aspose.Pdf.Tagged.ITaggedContent content = doc.TaggedContent;
            Aspose.Pdf.LogicalStructure.StructureElement rootElement = content.RootElement;
            content.SetLanguage("en-US");
    
            // Add the table of contents (TOC) page
            Aspose.Pdf.Page tocPage = doc.Pages.Add();
            tocPage.TocInfo = new Aspose.Pdf.TocInfo();
            tocPage.TocInfo.Title = new Aspose.Pdf.Text.TextFragment("Table of Contents");
    
            // Create a TOC structure element
            Aspose.Pdf.LogicalStructure.TOCElement tocElement = content.CreateTOCElement();
    
            // Create a header element for the TOC page title
            Aspose.Pdf.LogicalStructure.HeaderElement headerForTOCpageTitle = content.CreateHeaderElement(1);
            tocElement.LinkTocPageTitleToHeaderElement(tocPage, headerForTOCpageTitle);
    
            // Add the TOC page title header and TOC element to the document structure tree
            rootElement.AppendChild(headerForTOCpageTitle);
            rootElement.AppendChild(tocElement);
    
            // Add a content page
            doc.Pages.Add();
    
            // Create a header element and set its text
            Aspose.Pdf.LogicalStructure.HeaderElement header = content.CreateHeaderElement(1);
            header.SetText("1. Header");
    
            // Add the header to the document structure
            rootElement.AppendChild(header);
    
            // Create a TOC item (TOCI) element
            Aspose.Pdf.LogicalStructure.TOCIElement toci = content.CreateTOCIElement();
    
            // Add the TOCI element to the TOC element
            tocElement.AppendChild(toci);
    
            // Add an entry to the TOC page and link it to the TOCI element
            header.AddEntryToTocPage(tocPage, toci);
    
            // Add a logical reference to the header within the TOCI element
            toci.AddRef(header);
    
            // Create a list element for TOCI subitems
            Aspose.Pdf.LogicalStructure.ListElement listElement = content.CreateListElement();
            for (var i = 1; i <= 3; i++)
            {
                // Create a list item (LI) element
                Aspose.Pdf.LogicalStructure.ListLIElement li = content.CreateListLIElement();
    
                // Add the list item to the list element
                listElement.AppendChild(li);
    
                // Create a sub-header element and set its properties
                Aspose.Pdf.LogicalStructure.HeaderElement subHeader = content.CreateHeaderElement(2);
                subHeader.StructureTextState.FontSize = 14;
                subHeader.Language = "en-US";
                subHeader.SetText($@"1.{i} subheader ");
    
                // Add an entry to the TOC page and link it to the LI element
                subHeader.AddEntryToTocPage(tocPage, li);
    
                // Add a logical reference to the subheader element
                li.AddRef(subHeader);
    
                // Create a paragraph element and set its text and language
                Aspose.Pdf.LogicalStructure.ParagraphElement p = content.CreateParagraphElement();
                p.SetText("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.");
                p.Language = "en-US";
    
                // Add the sub-header and paragraph to the document structure
                rootElement.AppendChild(subHeader);
                rootElement.AppendChild(p);
            }
    
            // Add the list element as a child to the TOCI element
            toci.AppendChild(listElement);
    
            // --- Additional TOC header example ---
            // Create a second header element (see comments above for header 1)
            Aspose.Pdf.LogicalStructure.HeaderElement header2 = content.CreateHeaderElement(1);
            header2.SetText("2. Header");
            rootElement.AppendChild(header2);
    
            Aspose.Pdf.LogicalStructure.TOCIElement toci2 = content.CreateTOCIElement();
            tocElement.AppendChild(toci2);
    
            header2.AddEntryToTocPage(tocPage, toci2);
            toci2.AddRef(header2);
    
            // Save the PDF document
            doc.Save(dataDir + "CreatePdfWithTOCpageAdvanced_out.pdf");
        }
    }

.NET 8

    // For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
    private static void CreatePdfWithTOCpageAdvanced()
    {
        // The path to the documents directory
        var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();
    
        // Create PDF document
        using var doc = new Aspose.Pdf.Document();
        
        // Get tagged content for the PDF structure
        Aspose.Pdf.Tagged.ITaggedContent content = doc.TaggedContent;
        Aspose.Pdf.LogicalStructure.StructureElement rootElement = content.RootElement;
        content.SetLanguage("en-US");
    
        // Add the table of contents (TOC) page
        Aspose.Pdf.Page tocPage = doc.Pages.Add();
        tocPage.TocInfo = new Aspose.Pdf.TocInfo();
        tocPage.TocInfo.Title = new Aspose.Pdf.Text.TextFragment("Table of Contents");
    
        // Create a TOC structure element
        Aspose.Pdf.LogicalStructure.TOCElement tocElement = content.CreateTOCElement();
    
        // Create a header element for the TOC page title
        Aspose.Pdf.LogicalStructure.HeaderElement headerForTOCpageTitle = content.CreateHeaderElement(1);
        tocElement.LinkTocPageTitleToHeaderElement(tocPage, headerForTOCpageTitle);
    
        // Add the TOC page title header and TOC element to the document structure tree
        rootElement.AppendChild(headerForTOCpageTitle);
        rootElement.AppendChild(tocElement);
    
        // Add a content page
        doc.Pages.Add();
    
        // Create a header element and set its text
        Aspose.Pdf.LogicalStructure.HeaderElement header = content.CreateHeaderElement(1);
        header.SetText("1. Header");
    
        // Add the header to the document structure
        rootElement.AppendChild(header);
    
        // Create a TOC item (TOCI) element
        Aspose.Pdf.LogicalStructure.TOCIElement toci = content.CreateTOCIElement();
    
        // Add the TOCI element to the TOC element
        tocElement.AppendChild(toci);
    
        // Add an entry to the TOC page and link it to the TOCI element
        header.AddEntryToTocPage(tocPage, toci);
    
        // Add a logical reference to the header within the TOCI element
        toci.AddRef(header);
    
        // Create a list element for TOCI subitems
        Aspose.Pdf.LogicalStructure.ListElement listElement = content.CreateListElement();
        for (var i = 1; i <= 3; i++)
        {
            // Create a list item (LI) element
            Aspose.Pdf.LogicalStructure.ListLIElement li = content.CreateListLIElement();
    
            // Add the list item to the list element
            listElement.AppendChild(li);
    
            // Create a sub-header element and set its properties
            Aspose.Pdf.LogicalStructure.HeaderElement subHeader = content.CreateHeaderElement(2);
            subHeader.StructureTextState.FontSize = 14;
            subHeader.Language = "en-US";
            subHeader.SetText($@"1.{i} subheader ");
    
            // Add an entry to the TOC page and link it to the LI element
            subHeader.AddEntryToTocPage(tocPage, li);
    
            // Add a logical reference to the subheader element
            li.AddRef(subHeader);
    
            // Create a paragraph element and set its text and language
            Aspose.Pdf.LogicalStructure.ParagraphElement p = content.CreateParagraphElement();
            p.SetText("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.");
            p.Language = "en-US";
    
            // Add the sub-header and paragraph to the document structure
            rootElement.AppendChild(subHeader);
            rootElement.AppendChild(p);
        }
    
        // Add the list element as a child to the TOCI element
        toci.AppendChild(listElement);
    
        // --- Additional TOC header example ---
        // Create a second header element (see comments above for header 1)
        Aspose.Pdf.LogicalStructure.HeaderElement header2 = content.CreateHeaderElement(1);
        header2.SetText("2. Header");
        rootElement.AppendChild(header2);
    
        Aspose.Pdf.LogicalStructure.TOCIElement toci2 = content.CreateTOCIElement();
        tocElement.AppendChild(toci2);
    
        header2.AddEntryToTocPage(tocPage, toci2);
        toci2.AddRef(header2);
    
        // Save the PDF document
        doc.Save(dataDir + "CreatePdfWithTOCpageAdvanced_out.pdf");
    }