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XDocumentType Class

Represents an XML Document Type Definition (DTD).

System.Object
  System.Xml.Linq.XObject
    System.Xml.Linq.XNode
      System.Xml.Linq.XDocumentType

Namespace:  System.Xml.Linq
Assemblies:   System.Xml.XDocument (in System.Xml.XDocument.dll)
  System.Xml.Linq (in System.Xml.Linq.dll)

public class XDocumentType : XNode

The XDocumentType type exposes the following members.

  NameDescription
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsXDocumentType(XDocumentType)Initializes an instance of the XDocumentType class from another XDocumentType object.
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsXDocumentType(String, String, String, String)Initializes an instance of the XDocumentType class.
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  NameDescription
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsBaseUriGets the base URI for this XObject. (Inherited from XObject.)
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsDocumentGets the XDocument for this XObject. (Inherited from XObject.)
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsInternalSubsetGets or sets the internal subset for this Document Type Definition (DTD).
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsNameGets or sets the name for this Document Type Definition (DTD).
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsNextNodeGets the next sibling node of this node. (Inherited from XNode.)
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsNodeTypeGets the node type for this node. (Overrides XObject.NodeType.)
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsParentGets the parent XElement of this XObject. (Inherited from XObject.)
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsPreviousNodeGets the previous sibling node of this node. (Inherited from XNode.)
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsPublicIdGets or sets the public identifier for this Document Type Definition (DTD).
Public propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsSystemIdGets or sets the system identifier for this Document Type Definition (DTD).
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  NameDescription
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsAddAfterSelf(Object)Adds the specified content immediately after this node. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsAddAfterSelf(Object[])Adds the specified content immediately after this node. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsAddAnnotationAdds an object to the annotation list of this XObject. (Inherited from XObject.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsAddBeforeSelf(Object)Adds the specified content immediately before this node. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsAddBeforeSelf(Object[])Adds the specified content immediately before this node. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsAncestors()Returns a collection of the ancestor elements of this node. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsAncestors(XName)Returns a filtered collection of the ancestor elements of this node. Only elements that have a matching XName are included in the collection. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsAnnotation(Type)Gets the first annotation object of the specified type from this XObject. (Inherited from XObject.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsAnnotation<T>()Get the first annotation object of the specified type from this XObject. (Inherited from XObject.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsAnnotations(Type)Gets a collection of annotations of the specified type for this XObject. (Inherited from XObject.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsAnnotations<T>()Gets a collection of annotations of the specified type for this XObject. (Inherited from XObject.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsCreateReader()Creates an XmlReader for this node. (Inherited from XNode.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsCreateReader(ReaderOptions)Creates an XmlReader with the options specified by the readerOptions parameter. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsElementsAfterSelf()Returns a collection of the sibling elements after this node, in document order. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsElementsAfterSelf(XName)Returns a filtered collection of the sibling elements after this node, in document order. Only elements that have a matching XName are included in the collection. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsElementsBeforeSelf()Returns a collection of the sibling elements before this node, in document order. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsElementsBeforeSelf(XName)Returns a filtered collection of the sibling elements before this node, in document order. Only elements that have a matching XName are included in the collection. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsIsAfterDetermines if the current node appears after a specified node in terms of document order. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsIsBeforeDetermines if the current node appears before a specified node in terms of document order. (Inherited from XNode.)
Protected methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsNodesAfterSelfReturns a collection of the sibling nodes after this node, in document order. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsNodesBeforeSelfReturns a collection of the sibling nodes before this node, in document order. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsRemoveRemoves this node from its parent. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsRemoveAnnotations(Type)Removes the annotations of the specified type from this XObject. (Inherited from XObject.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsRemoveAnnotations<T>()Removes the annotations of the specified type from this XObject. (Inherited from XObject.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsReplaceWith(Object)Replaces this node with the specified content. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsReplaceWith(Object[])Replaces this node with the specified content. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsToString()Returns the indented XML for this node. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsToString(SaveOptions)Returns the XML for this node, optionally disabling formatting. (Inherited from XNode.)
Public methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsWriteToWrite this XDocumentType to an XmlWriter. (Overrides XNode.WriteTo(XmlWriter).)
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  NameDescription
Public eventSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsChangedRaised when this XObject or any of its descendants have changed. (Inherited from XObject.)
Public eventSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsChangingRaised when this XObject or any of its descendants are about to change. (Inherited from XObject.)
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  NameDescription
Public Extension MethodCreateNavigator()Overloaded. Creates an XPathNavigator for an XNode. (Defined by Extensions.)
Public Extension MethodCreateNavigator(XmlNameTable)Overloaded. Creates an XPathNavigator for an XNode. The XmlNameTable enables more efficient XPath expression processing. (Defined by Extensions.)
Public Extension MethodXPathEvaluate(String)Overloaded. Evaluates an XPath expression. (Defined by Extensions.)
Public Extension MethodXPathEvaluate(String, IXmlNamespaceResolver)Overloaded. Evaluates an XPath expression, resolving namespace prefixes using the specified IXmlNamespaceResolver. (Defined by Extensions.)
Public Extension MethodXPathSelectElement(String)Overloaded. Selects an XElement using a XPath expression. (Defined by Extensions.)
Public Extension MethodXPathSelectElement(String, IXmlNamespaceResolver)Overloaded. Selects an XElement using a XPath expression, resolving namespace prefixes using the specified IXmlNamespaceResolver. (Defined by Extensions.)
Public Extension MethodXPathSelectElements(String)Overloaded. Selects a collection of elements using an XPath expression. (Defined by Extensions.)
Public Extension MethodXPathSelectElements(String, IXmlNamespaceResolver)Overloaded. Selects a collection of elements using an XPath expression, resolving namespace prefixes using the specified IXmlNamespaceResolver. (Defined by Extensions.)
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  NameDescription
Explicit interface implemetationPrivate methodSupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsIXmlLineInfo.HasLineInfoGets a value indicating whether or not this XObject has line information. (Inherited from XObject.)
Explicit interface implemetationPrivate propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsIXmlLineInfo.LineNumberGets the line number that the underlying XmlReader reported for this XObject. (Inherited from XObject.)
Explicit interface implemetationPrivate propertySupported by the XNA FrameworkSupported by Portable Class LibrarySupported in .NET for Windows Store appsIXmlLineInfo.LinePositionGets the line position that the underlying XmlReader reported for this XObject. (Inherited from XObject.)
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Data Type Definitions (DTD) in XML are a way to do the following:

  • Validate XML trees to a limited extent.

  • Expand entities, which is a form of text replacement.

  • Supply default attributes.

This class represents the XML concept of a DTD.

DTD support in LINQ to XML is limited. 

LINQ to XML will expand internal entities by default, but it will not resolve external entity references unless an XmlReader with an associated XmlResolver is used to load the XML tree.

LINQ to XML will not validate a document against a DTD, but you can use a validating XmlReader to perform DTD validation if necessary.

To validate an LINQ to XML tree against an XML schema, use the Validate method.

When a document contains entity references that are defined in a DTD, the references are expanded upon creation of the XML tree. However, when you serialize or save the XML tree, the content of the expanded entities is preserved; the entity references are not.

Default attributes from the DTD will be materialized as regular attributes in the XML tree. After a default attribute from the DTD is materialized, there is no way to determine that the attribute was a default attribute from the DTD.

You can populate an XML tree with an XML document that contains an internal DTD. The XML tree will then contain a DocumentType node. When you serialize or save the tree, the internal DTD will also be saved as part of the document.

.NET Framework

Supported in: 4.6, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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