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IDocument

Interface

The

Document
interface represents the entire HTML or XML document. Conceptually, it is the root of the document tree, and provides the primary access to the document's data.

Since elements, text nodes, comments, processing instructions, etc. cannot exist outside the context of a

Document
, the
Document
interface also contains the factory methods needed to create these objects. The
Node
objects created have a
ownerDocument
attribute which associates them with the
Document
within whose context they were created.

See also the Document Object Model (DOM) Level 2 Core Specification.

Definition

Properties

The Document Type Declaration (see

DocumentType
) associated with this document. For HTML documents as well as XML documents without a document type declaration this returns
null
. The DOM Level 2 does not support editing the Document Type Declaration.
docType
cannot be altered in any way, including through the use of methods inherited from the
Node
interface, such as
insertNode
or
removeNode
.

C#
IDocumentType Doctype { get; }

This is a convenience attribute that allows direct access to the child node that is the root element of the document. For HTML documents, this is the element with the tagName "HTML".

C#
IElement DocumentElement { get; }

The

DOMImplementation
object that handles this document. A DOM application may use objects from multiple implementations.

C#
IDomImplementation Implementation { get; }

Methods

Creates an

Attr
of the given name. Note that the
Attr
instance can then be set on an
Element
using the
setAttributeNode
method.
To create an attribute with a qualified name and namespace URI, use the
createAttributeNS
method.

C#
IAttr CreateAttribute(string name)
Parameters:namestring

The name of the attribute.

Returns:

IAttr

A new

Attr
object with the
nodeName
attribute set to
name
, and
localName
,
prefix
, and
namespaceURI
set to
null
. The value of the attribute is the empty string.

Exceptions: DomException

INVALID_CHARACTER_ERR: Raised if the specified name contains an illegal character.

Creates an attribute of the given qualified name and namespace URI. HTML-only DOM implementations do not need to implement this method.

C#
IAttr CreateAttributeNS(string namespaceUri, string qualifiedName)
Parameters:namespaceUristring

The namespace URI of the attribute to create.

qualifiedNamestring

The qualified name of the attribute to instantiate.

Returns:

IAttr

A new

Attr
object with the following attributes: AttributeValue
Node.nodeName
qualifiedName
Node.namespaceURI
namespaceURI
Node.prefix
prefix, extracted from
qualifiedName
, or
null
if there is no prefix
Node.localName
local name, extracted from
qualifiedName
Attr.name
qualifiedName
Node.nodeValue
the empty string

DomException

INVALID_CHARACTER_ERR: Raised if the specified qualified name contains an illegal character.
NAMESPACE_ERR: Raised if the

qualifiedName
is malformed, if the
qualifiedName
has a prefix and the

csharp
namespaceURI
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null
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qualifiedName
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namespaceURI

http://www.w3.org/XML/1998/namespace", or if the

csharp
qualifiedName
csharp
namespaceURI

http://www.w3.org/2000/xmlns/".

Creates a

CDATASection
node whose value is the specified string.

C#
ICdataSection CreateCdataSection(string data)
Parameters:datastring

The data for the

CDATASection
contents.

Returns:

ICdataSection

The new

CDATASection
object.

Exceptions: DomException

NOT_SUPPORTED_ERR: Raised if this document is an HTML document.

Creates a

Comment
node given the specified string.

C#
IComment CreateComment(string data)
Parameters:datastring

The data for the node.

Returns:

IComment

The new

Comment
object.

Creates an empty

DocumentFragment
object.

C#
IDocumentFragment CreateDocumentFragment()
Returns:

IDocumentFragment

A new

DocumentFragment
.

Creates an element of the type specified. Note that the instance returned implements the

Element
interface, so attributes can be specified directly on the returned object.
In addition, if there are known attributes with default values,
Attr
nodes representing them are automatically created and attached to the element.
To create an element with a qualified name and namespace URI, use the
createElementNS
method.

C#
IElement CreateElement(string tagName)
Parameters:tagNamestring

The name of the element type to instantiate. For XML, this is case-sensitive. For HTML, the

tagName
parameter may be provided in any case, but it must be mapped to the canonical uppercase form by the DOM implementation.

Returns:

IElement

A new

Element
object with the
nodeName
attribute set to
tagName
, and
localName
,
prefix
, and
namespaceURI
set to
null
.

Exceptions: DomException

INVALID_CHARACTER_ERR: Raised if the specified name contains an illegal character.

Creates an element of the given qualified name and namespace URI. HTML-only DOM implementations do not need to implement this method.

C#
IElement CreateElementNS(string namespaceUri, string qualifiedName)
Parameters:namespaceUristring

The namespace URI of the element to create.

qualifiedNamestring

The qualified name of the element type to instantiate.

Returns:

IElement

A new

Element
object with the following attributes:AttributeValue
Node.nodeName
qualifiedName
Node.namespaceURI
namespaceURI
Node.prefix
prefix, extracted from
qualifiedName
, or
null
if there is no prefix
Node.localName
local name, extracted from
qualifiedName
Element.tagName
qualifiedName

DomException

INVALID_CHARACTER_ERR: Raised if the specified qualified name contains an illegal character.
NAMESPACE_ERR: Raised if the

qualifiedName
is malformed, if the
qualifiedName
has a prefix and the

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namespaceURI
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null
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qualifiedName
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namespaceURI

http://www.w3.org/XML/1998/namespace" .

Creates an

EntityReference
object. In addition, if the referenced entity is known, the child list of the
EntityReference
node is made the same as that of the corresponding
Entity
node.If any descendant of the
Entity
node has an unbound namespace prefix, the corresponding descendant of the created
EntityReference
node is also unbound; (its
namespaceURI
is
null
). The DOM Level 2 does not support any mechanism to resolve namespace prefixes.

C#
IEntityReference CreateEntityReference(string name)
Parameters:namestring

The name of the entity to reference.

Returns:

IEntityReference

The new

EntityReference
object.

Exceptions: DomException

INVALID_CHARACTER_ERR: Raised if the specified name contains an illegal character.
NOT_SUPPORTED_ERR: Raised if this document is an HTML document.

Creates a

ProcessingInstruction
node given the specified name and data strings.

C#
IProcessingInstruction CreateProcessingInstruction(string target, string data)
Parameters:targetstring

The target part of the processing instruction.

datastring

The data for the node.

Returns:

IProcessingInstruction

The new

ProcessingInstruction
object.

Exceptions: DomException

INVALID_CHARACTER_ERR: Raised if the specified target contains an illegal character.
NOT_SUPPORTED_ERR: Raised if this document is an HTML document.

Creates a

Text
node given the specified string.

C#
IText CreateTextNode(string data)
Parameters:datastring

The data for the node.

Returns:

IText

The new

Text
object.

Returns the

Element
whose
ID
is given by
elementId
. If no such element exists, returns
null
. Behavior is not defined if more than one element has this
ID
. The DOM implementation must have information that says which attributes are of type ID. Attributes with the name "ID" are not of type ID unless so defined. Implementations that do not know whether attributes are of type ID or not are expected to return
null
.

C#
IElement GetElementById(string elementId)
Parameters:elementIdstring

The unique

id
value for an element.

Returns:

IElement

The matching element.

Returns a

NodeList
of all the
Elements
with a given tag name in the order in which they are encountered in a preorder traversal of the
Document
tree.

C#
INodeList GetElementsByTagName(string tagName)
Parameters:tagNamestring

The name of the tag to match on. The special value "*" matches all tags.

Returns:

INodeList

A new

NodeList
object containing all the matched
Elements
.

Returns a

NodeList
of all the
Elements
with a given local name and namespace URI in the order in which they are encountered in a preorder traversal of the
Document
tree.

C#
INodeList GetElementsByTagNameNS(string namespaceUri, string localName)
Parameters:namespaceUristring

The namespace URI of the elements to match on. The special value "*" matches all namespaces.

localNamestring

The local name of the elements to match on. The special value "*" matches all local names.

Returns:

INodeList

A new

NodeList
object containing all the matched
Elements
.

Imports a node from another document to this document. The returned node has no parent; (

parentNode
is
null
). The source node is not altered or removed from the original document; this method creates a new copy of the source node.
For all nodes, importing a node creates a node object owned by the importing document, with attribute values identical to the source node's
nodeName
and
nodeType
, plus the attributes related to namespaces (
prefix
,
localName
, and
namespaceURI
). As in the
cloneNode
operation on a
Node
, the source node is not altered.
Additional information is copied as appropriate to the
nodeType
, attempting to mirror the behavior expected if a fragment of XML or HTML source was copied from one document to another, recognizing that the two documents may have different DTDs in the XML case. The following list describes the specifics for each type of node.
ATTRIBUTE_NODE
The
ownerElement
attribute is set to
null
and the
specified
flag is set to
true
on the generated
Attr
. The descendants of the source
Attr
are recursively imported and the resulting nodes reassembled to form the corresponding subtree. Note that the
deep
parameter has no effect on
Attr
nodes; they always carry their children with them when imported.
DOCUMENT_FRAGMENT_NODE
If the
deep
option was set to
true
, the descendants of the source element are recursively imported and the resulting nodes reassembled to form the corresponding subtree. Otherwise, this simply generates an empty
DocumentFragment
.
DOCUMENT_NODE
Document
nodes cannot be imported.
DOCUMENT_TYPE_NODE
DocumentType
nodes cannot be imported.
ELEMENT_NODE
Specified attribute nodes of the source element are imported, and the generated
Attr
nodes are attached to the generated
Element
. Default attributes are not copied, though if the document being imported into defines default attributes for this element name, those are assigned. If the
importNode
deep
parameter was set to
true
, the descendants of the source element are recursively imported and the resulting nodes reassembled to form the corresponding subtree.
ENTITY_NODE
Entity
nodes can be imported, however in the current release of the DOM the
DocumentType
is readonly. Ability to add these imported nodes to a
DocumentType
will be considered for addition to a future release of the DOM.On import, the
publicId
,
systemId
, and
notationName
attributes are copied. If a
deep
import is requested, the descendants of the the source
Entity
are recursively imported and the resulting nodes reassembled to form the corresponding subtree.
ENTITY_REFERENCE_NODE
Only the
EntityReference
itself is copied, even if a
deep
import is requested, since the source and destination documents might have defined the entity differently. If the document being imported into provides a definition for this entity name, its value is assigned.
NOTATION_NODE
Notation
nodes can be imported, however in the current release of the DOM the
DocumentType
is readonly. Ability to add these imported nodes to a
DocumentType
will be considered for addition to a future release of the DOM.On import, the
publicId
and
systemId
attributes are copied. Note that the
deep
parameter has no effect on
Notation
nodes since they never have any children.
PROCESSING_INSTRUCTION_NODE
The imported node copies its
target
and
data
values from those of the source node.
TEXT_NODE, CDATA_SECTION_NODE, COMMENT_NODE
These three types of nodes inheriting from
CharacterData
copy their
data
and
length
attributes from those of the source node.

C#
INode ImportNode(INode importedNode, bool deep)
Parameters:importedNodeINode

The node to import.

deepbool

If

true
, recursively import the subtree under the specified node; if
false
, import only the node itself, as explained above. This has no effect on
Attr
,
EntityReference
, and
Notation
nodes.

Returns:

INode

The imported node that belongs to this

Document
.

Exceptions: DomException

NOT_SUPPORTED_ERR: Raised if the type of node being imported is not supported.