XmlReaderSettings.DtdProcessing XmlReaderSettings.DtdProcessing XmlReaderSettings.DtdProcessing XmlReaderSettings.DtdProcessing Property

Definición

Obtiene o establece un valor que determine el procesamiento de DTD.Gets or sets a value that determines the processing of DTDs.

public:
 property System::Xml::DtdProcessing DtdProcessing { System::Xml::DtdProcessing get(); void set(System::Xml::DtdProcessing value); };
public System.Xml.DtdProcessing DtdProcessing { get; set; }
member this.DtdProcessing : System.Xml.DtdProcessing with get, set
Public Property DtdProcessing As DtdProcessing

Valor de propiedad

Uno de los valores de enumeración que determina el procesamiento de DTD.One of the enumeration values that determines the processing of DTDs. De manera predeterminada, es Prohibit.The default is Prohibit.

Ejemplos

En el siguiente ejemplo se valida un archivo XML utilizando un archivo DTD.The following example validates an XML file using a DTD file.

#using <System.Xml.dll>

using namespace System;
using namespace System::Xml;
using namespace System::Xml::Schema;
using namespace System::IO;

// Display any validation errors.
static void ValidationCallBack( Object^ /*sender*/, ValidationEventArgs^ e )
{
   Console::WriteLine( L"Validation Error: {0}", e->Message );
}

int main()
{
   // Set the validation settings.
   XmlReaderSettings^ settings = gcnew XmlReaderSettings;
   settings->DtdProcessing = DtdProcessing::Parse;
   settings->ValidationType = ValidationType::DTD;
   settings->ValidationEventHandler += gcnew ValidationEventHandler( ValidationCallBack );

   // Create the XmlReader object.
   XmlReader^ reader = XmlReader::Create( L"itemDTD.xml", settings );

   // Parse the file. 
   while ( reader->Read() )
      ;

   return 1;
}
using System;
using System.Xml;
using System.Xml.Schema;
using System.IO;

public class Sample {

  public static void Main() {

    // Set the validation settings.
    XmlReaderSettings settings = new XmlReaderSettings();
    settings.DtdProcessing = DtdProcessing.Parse;
    settings.ValidationType = ValidationType.DTD;
    settings.ValidationEventHandler += new ValidationEventHandler (ValidationCallBack);
 
    // Create the XmlReader object.
    XmlReader reader = XmlReader.Create("itemDTD.xml", settings);


    // Parse the file. 
    while (reader.Read());
    
  }

  // Display any validation errors.
  private static void ValidationCallBack(object sender, ValidationEventArgs e) {
    Console.WriteLine("Validation Error: {0}", e.Message);
  }
}
Imports System.Xml
Imports System.Xml.Schema
Imports System.IO

public class Sample 

  public shared sub Main() 

    ' Set the validation settings.
    Dim settings as XmlReaderSettings = new XmlReaderSettings()
    settings.DtdProcessing = DtdProcessing.Parse
    settings.ValidationType = ValidationType.DTD
    AddHandler settings.ValidationEventHandler, AddressOf ValidationCallBack
 
    ' Create the XmlReader object.
    Dim reader as XmlReader = XmlReader.Create("itemDTD.xml", settings)

    ' Parse the file. 
    while reader.Read()
    end while
    
  end sub

  ' Display any validation errors.
  private shared sub ValidationCallBack(sender as object, e as ValidationEventArgs) 
    Console.WriteLine("Validation Error: {0}", e.Message)
  end sub
end class

EntradaInput

En el ejemplo se utiliza como entrada el archivo itemDTD.xml.The example uses the itemDTD.xml file as input.

<!--XML file using a DTD-->
<!DOCTYPE store [
  <!ELEMENT store (item)*> 
  <!ELEMENT item (name,dept,price)>
  <!ATTLIST item type CDATA #REQUIRED>
  <!ELEMENT name (#PCDATA)>
  <!ELEMENT price (#PCDATA)>]>
<store>
  <item type="supplies"  ISBN="2-3631-4">
    <name>paint</name>
    <price>16.95</price>
  </item>
</store>

Comentarios

La validación de la definición de tipo de documento (DTD) se implementa mediante las restricciones de validez definidas en la recomendación W3C lenguaje de marcado extensible (XML) 1,0 (cuarta edición).Document type definition (DTD) validation is implemented by using the validity constraints defined in the W3C Extensible Markup Language (XML) 1.0 (fourth edition) recommendation. Las DTD usan una gramática formal para describir la estructura y la sintaxis de los documentos XML compatibles; especifican el contenido y los valores permitidos para el documento XML.DTDs use a formal grammar to describe the structure and syntax of compliant XML documents; they specify the content and values allowed for the XML document.

Esta propiedad puede tener uno de los siguientes valores:This property can have one of the following values:

Para llevar a cabo una validación con una DTD, XmlReader utiliza la DTD definida en la declaración DOCTYPE de un documento XML.To perform validation against a DTD, the XmlReader uses the DTD defined in the DOCTYPE declaration of an XML document. La declaración DOCTYPE puede apuntar a una DTD en línea o hacer referencia a un archivo DTD externo.The DOCTYPE declaration can either point to an inline DTD or can be a reference to an external DTD file. Para validar un archivo XML con una DTD:To validate an XML file against a DTD:

Importante

Si la DtdProcessing propiedad se establece en DtdProcessing.Ignore, el XmlReader no notificará las DTD.If the DtdProcessing property is set to DtdProcessing.Ignore, the XmlReader will not report the DTDs. Esto significa que la DTD/DOCTYPE se perderá en la salida.This means that the DTD/DOCTYPE will be lost on output.

Se aplica a