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XDocumentType.InternalSubset Property

Gets or sets the internal subset for this Document Type Definition (DTD).

Namespace:  System.Xml.Linq
Assembly:  System.Xml.Linq (in System.Xml.Linq.dll)

public string InternalSubset { get; set; }

Property Value

Type: System.String
A String that contains the internal subset for this Document Type Definition (DTD).

The following example creates a document with a DTD that contains an internal subset.

string internalSubset = @"<!ELEMENT Pubs (Book+)>
<!ELEMENT Book (Title, Author)>
<!ELEMENT Title (#PCDATA)>
<!ELEMENT Author (#PCDATA)>";

string target = "xml-stylesheet";
string data = "href=\"mystyle.css\" title=\"Compact\" type=\"text/css\"";

XDocument doc = new XDocument(
    new XComment("This is a comment."),
    new XProcessingInstruction(target, data),
    new XDocumentType("Pubs", null, null, internalSubset),
    new XElement("Pubs", 
        new XElement("Book",
            new XElement("Title", "Artifacts of Roman Civilization"),
            new XElement("Author", "Moreno, Jordao")
        ),
        new XElement("Book",
            new XElement("Title", "Midieval Tools and Implements"),
            new XElement("Author", "Gazit, Inbar")
        )
    ),
    new XComment("This is another comment.")
);
doc.Declaration = new XDeclaration("1.0", "utf-8", "true");

Console.WriteLine(doc.DocumentType.InternalSubset);

This example produces the following output:

<!ELEMENT Pubs (Book+)>
<!ELEMENT Book (Title, Author)>
<!ELEMENT Title (#PCDATA)>
<!ELEMENT Author (#PCDATA)>

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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