XDocumentType Class
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Represents an XML Document Type Definition (DTD).
Assembly: System.Xml.Linq (in System.Xml.Linq.dll)
The XDocumentType type exposes the following members.
| Name | Description | |
|---|---|---|
 | XDocumentType(XDocumentType) | Initializes an instance of the XDocumentType class from another XDocumentType object. |
| XDocumentType(String, String, String, String) | Initializes an instance of the XDocumentType class. |
| Name | Description | |
|---|---|---|
 | BaseUri | Gets the base URI for this XObject. (Inherited from XObject.) |
| Document | Gets the XDocument for this XObject. (Inherited from XObject.) |
| InternalSubset | Gets or sets the internal subset for this Document Type Definition (DTD). |
| Name | Gets or sets the name for this Document Type Definition (DTD). |
| NextNode | Gets the next sibling node of this node. (Inherited from XNode.) |
| NodeType | Gets the node type for this node. (Overrides XObject::NodeType.) |
| Parent | Gets the parent XElement of this XObject. (Inherited from XObject.) |
| PreviousNode | Gets the previous sibling node of this node. (Inherited from XNode.) |
| PublicId | Gets or sets the public identifier for this Document Type Definition (DTD). |
| SystemId | Gets or sets the system identifier for this Document Type Definition (DTD). |
| Name | Description | |
|---|---|---|
| AddAfterSelf(Object) | Adds the specified content immediately after this node. (Inherited from XNode.) |
| AddAfterSelf(array<Object>) | Adds the specified content immediately after this node. (Inherited from XNode.) |
| AddAnnotation | Adds an object to the annotation list of this XObject. (Inherited from XObject.) |
| AddBeforeSelf(Object) | Adds the specified content immediately before this node. (Inherited from XNode.) |
| AddBeforeSelf(array<Object>) | Adds the specified content immediately before this node. (Inherited from XNode.) |
| Ancestors() | Returns a collection of the ancestor elements of this node. (Inherited from XNode.) |
| Ancestors(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.) |
| Annotation(Type) | Gets the first annotation object of the specified type from this XObject. (Inherited from XObject.) |
| Annotation<T>() | Get the first annotation object of the specified type from this XObject. (Inherited from XObject.) |
| Annotations(Type) | Gets a collection of annotations of the specified type for this XObject. (Inherited from XObject.) |
| Annotations<T>() | Gets a collection of annotations of the specified type for this XObject. (Inherited from XObject.) |
| CreateReader() | Creates an XmlReader for this node. (Inherited from XNode.) |
| CreateReader(ReaderOptions) | Creates an XmlReader for this node. (Inherited from XNode.) |
| ElementsAfterSelf() | Returns a collection of the sibling elements after this node, in document order. (Inherited from XNode.) |
| ElementsAfterSelf(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.) |
| ElementsBeforeSelf() | Returns a collection of the sibling elements before this node, in document order. (Inherited from XNode.) |
| ElementsBeforeSelf(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.) |
| Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
 | Finalize | Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) |
| GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| IsAfter | Determines if the current node appears after a specified node in terms of document order. (Inherited from XNode.) |
| IsBefore | Determines if the current node appears before a specified node in terms of document order. (Inherited from XNode.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| NodesAfterSelf | Returns a collection of the sibling nodes after this node, in document order. (Inherited from XNode.) |
| NodesBeforeSelf | Returns a collection of the sibling nodes before this node, in document order. (Inherited from XNode.) |
| Remove | Removes this node from its parent. (Inherited from XNode.) |
| RemoveAnnotations(Type) | Removes the annotations of the specified type from this XObject. (Inherited from XObject.) |
| RemoveAnnotations<T>() | Removes the annotations of the specified type from this XObject. (Inherited from XObject.) |
| ReplaceWith(Object) | Replaces this node with the specified content. (Inherited from XNode.) |
| ReplaceWith(array<Object>) | Replaces this node with the specified content. (Inherited from XNode.) |
| ToString() | Returns the indented XML for this node. (Inherited from XNode.) |
| ToString(SaveOptions) | Returns the XML for this node, optionally disabling formatting. (Inherited from XNode.) |
| WriteTo | Write this XDocumentType to an XmlWriter. (Overrides XNode::WriteTo(XmlWriter).) |
| Name | Description | |
|---|---|---|
  | IXmlLineInfo::HasLineInfo | Gets a value indicating whether or not this XObject has line information. (Inherited from XObject.) |
 | IXmlLineInfo::LineNumber | Gets the line number that the underlying XmlReader reported for this XObject. (Inherited from XObject.) |
| IXmlLineInfo::LinePosition | Gets the line position that the underlying XmlReader reported for this XObject. (Inherited from XObject.) |
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.
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.