Crear PDF Etiquetado usando C#

Crear un PDF etiquetado significa agregar (o crear) ciertos elementos al documento que permitirán que el documento sea validado de acuerdo con los requisitos de PDF/UA. Estos elementos se llaman a menudo Elementos de Estructura.

El siguiente fragmento de código también funciona con la biblioteca Aspose.PDF.Drawing.

Creando PDF Etiquetado (Escenario Simple)

Para crear elementos de estructura en un Documento PDF Etiquetado, Aspose.PDF ofrece métodos para crear elementos de estructura usando la interfaz ITaggedContent. El siguiente fragmento de código muestra cómo crear un PDF etiquetado que contiene 2 elementos: encabezado y párrafo.

.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");
}

Obtendremos el siguiente documento después de la creación:

Creando PDF Etiquetado con elementos anidados (Creando Árbol de Elementos de Estructura)

En algunos casos, necesitamos crear una estructura más compleja, por ejemplo, colocar citas en un párrafo. Para crear un árbol de elementos de estructura, debemos usar el método AppendChild. El siguiente fragmento de código muestra cómo crear un árbol de elementos de estructura de un Documento PDF Etiquetado:

.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");
}

Obtendremos el siguiente documento después de la creación:

Estilizando la Estructura del Texto

Para estilizar la estructura del texto en un Documento PDF Etiquetado, Aspose.PDF ofrece las propiedades Font, FontSize, FontStyle y ForegroundColor de la Clase StructureTextState. El siguiente fragmento de código muestra cómo estilizar la estructura del texto en un Documento PDF Etiquetado:

.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");
}

Ilustrando Elementos de Estructura

Para ilustrar elementos de estructura en un Documento PDF Etiquetado, Aspose.PDF ofrece la clase IllustrationElement. El siguiente fragmento de código muestra cómo ilustrar elementos de estructura en un Documento PDF Etiquetado:

.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");
}

Validar PDF Etiquetado

Aspose.PDF for .NET proporciona la capacidad de validar documentos PDF Etiquetados PDF/UA. La validación del estándar PDF/UA soporta:

• Verificaciones de XObjects.
• Verificaciones de Acciones.
• Verificaciones de Contenido Opcional.
• Verificaciones de Archivos Embebidos.
• Verificaciones de Campos de Acroform (Validar Lenguaje Natural y Nombre Alternativo y Firmas Digitales).
• Verificaciones de Campos de Formulario XFA.
• Verificaciones de configuraciones de Seguridad.
• Verificaciones de Navegación.
• Verificaciones de Anotaciones.

El siguiente fragmento de código muestra cómo validar el Documento PDF Etiquetado. Los problemas correspondientes se mostrarán en el informe de registro XML.

.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);
}

Ajustar la posición de la Estructura de Texto

El siguiente fragmento de código muestra cómo ajustar la posición de la Estructura de Texto en el documento PDF Etiquetado:

.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");
}