http://msdn.microsoft.com/zh-cn/library/vstudio/hf9hbf87.aspx

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<?xml version="1.0"?><books><book><author>Carson</author><price format="dollar">31.95</price><pubdate>05/01/2001</pubdate></book><pubinfo><publisher>MSPress</publisher><state>WA</state></pubinfo></books>

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在 XML 文檔結構中，此圖中的每個圓圈表示一個節點（稱為?XmlNode?對象）。?

XmlNode?對象是 DOM 樹中的基本對象。?

XmlDocument?類（擴展XmlNode）支持用于對整個文檔執行操作（例如，將文檔加載到內存中或將 XML 保存到文件中）的方法。

此外，XmlDocument?提供了查看和處理整個 XML 文檔中的節點的方法。?XmlNode?和?XmlDocument?都具有性能和可用性增強，并通過方法和屬性執行下列操作：

• 訪問和修改 DOM 特定的節點，如元素節點、實體引用節點等。

• 除檢索節點包含的信息（如元素節點中的文本）外，還檢索整個節點。

Node?對象具有一組方法和屬性以及基本的和定義完善的特性。其中的某些特性包括：

• 節點有單個父節點，父節點是與節點相鄰的上一級節點。唯一沒有父級的節點是文檔根，因為它是頂級節點，包含了文檔本身和文檔片段。

• 大多數節點可以有多個子節點，子節點是與節點相鄰的下一級節點。以下是可以有子節點的節點類型列表。

  • Document

  • DocumentFragment

  • EntityReference

  • Element

  • Attribute

  XmlDeclaration、Notation、Entity、CDATASection、Text、Comment、ProcessingInstruction?和?DocumentType?節點沒有子節點。

• 處于同一級別、在關系圖中由?book?和?pubinfo?節點表示的節點是同級。

DOM 的一個特性是處理屬性的方式。屬性是不屬于父子關系和同級關系的節點。屬性被視為元素節點的屬性，由名稱和值對組成。

例如，如果存在由與元素price?關聯的?format="dollar" 組成的 XML 數據，則單詞?format?是名稱，format?屬性的值是?dollar。

為檢索?price?節點的?format="dollar"?屬性，可以在游標位于?price?元素節點時調用?GetAttribute?方法。有關更多信息，請參見訪問 DOM 中的屬性。

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http://linder0209.iteye.com/blog/1458823

http://www.css88.com/archives/5017

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(一)nodeName?屬性含有某個節點的名稱。

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元素節點的?nodeName?是標簽名稱

屬性節點的?nodeName?是屬性名稱

文本節點的?nodeName?永遠是?#text

文檔節點的?nodeName?永遠是?#document

注釋：nodeName?所包含的?XML?元素的標簽名稱永遠是 大寫 的

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nodeName 屬性含有某個節點的名稱。

• 元素（element）節點的 nodeName 是標簽名稱
• 屬性（attribute）節點的 nodeName 是屬性名稱
• 文本（text）節點的 nodeName 永遠是 #text
• 文檔（document）節點的 nodeName 永遠是 #document

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(二)nodeValue

對于文本節點，nodeValue?屬性包含文本。

對于屬性節點，nodeValue?屬性包含屬性值。

nodeValue?屬性對于文檔節點 <document> 和元素節點 <element> 是不可用的。

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(三)nodeType

nodeType?屬性可返回節點的類型。

最重要的節點類型是：

元素類型?節點類型

元素element?1

屬性attr?2

文本text?3

注釋comments???8

文檔document???9

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http://www.w3schools.com/dom/dom_nodetype.asp

Node Types

The following table lists the different W3C node types, and which node types they may have as children:

Node typeDescriptionChildren

Document	Represents the entire document (the root-node of the DOM tree)	Element (max. one), ProcessingInstruction, Comment, DocumentType
DocumentFragment	Represents a "lightweight" Document object, which can hold a portion of a document	Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference
DocumentType	Provides an interface to the entities defined for the document	None
ProcessingInstruction	Represents a processing instruction	None
EntityReference	Represents an entity reference	Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference
Element	Represents an element	Element, Text, Comment, ProcessingInstruction, CDATASection, EntityReference
Attr	Represents an attribute	Text, EntityReference
Text	Represents textual content in an element or attribute	None
CDATASection	Represents a CDATA section in a document (text that will NOT be parsed by a parser)	None
Comment	Represents a comment	None
Entity	Represents an entity	Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference
Notation	Represents a notation declared in the DTD	None

Node Types - Return Values

The following table lists what the nodeName and the nodeValue properties will return for each node type:

Node typenodeName returnsnodeValue returns

Document	#document	null
DocumentFragment	#document fragment	null
DocumentType	doctype name	null
EntityReference	entity reference name	null
Element	element name	null
Attr	attribute name	attribute value
ProcessingInstruction	target	content of node
Comment	#comment	comment text
Text	#text	content of node
CDATASection	#cdata-section	content of node
Entity	entity name	null
Notation	notation name	null

NodeTypes - Named Constants

NodeTypeNamed Constant

1	ELEMENT_NODE
2	ATTRIBUTE_NODE
3	TEXT_NODE
4	CDATA_SECTION_NODE
5	ENTITY_REFERENCE_NODE
6	ENTITY_NODE
7	PROCESSING_INSTRUCTION_NODE
8	COMMENT_NODE
9	DOCUMENT_NODE
10	DOCUMENT_TYPE_NODE
11	DOCUMENT_FRAGMENT_NODE
12	NOTATION_NODE

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?http://www.w3school.com.cn/xmldom/dom_nodes_nodelist.asp

<bookstore><book category="children"><title lang="en">Harry Potter</title><author>J K. Rowling</author><year>2005</year><price>29.99</price></book><book category="cooking"><title lang="en">Everyday Italian</title><author>Giada De Laurentiis</author><year>2005</year><price>30.00</price></book><book category="web" cover="paperback"><title lang="en">Learning XML</title><author>Erik T. Ray</author><year>2003</year><price>39.95</price></book><book category="web"><title lang="en">XQuery Kick Start</title><author>James McGovern</author><author>Per Bothner</author><author>Kurt Cagle</author><author>James Linn</author><author>Vaidyanathan Nagarajan</author><year>2003</year><price>49.99</price></book> </bookstore>

下面的圖像表示 "books.xml" 中 <title> 元素的節點列表：

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Xml.XMLIntf.IXMLNode.NodeType

Indicates the type of the node.

Read NodeType to determine the type of the node. The type reflects the way the node is used in the XML document.?

TNodeType = (ntReserved, ntElement, ntAttribute, ntText, ntCData,ntEntityRef, ntEntity, ntProcessingInstr, ntComment, ntDocument,ntDocType, ntDocFragment, ntNotation);

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Xml.XMLIntf.IXMLNode.NodeName

Indicates the node name.

NodeName is the name of the underlying DOM node.

The node's name depends on the type of the node, as indicated in the following table:

?

NodeTypeNodeName

ntAttribute	The attribute name
ntElement	The tag name
ntText	'#text'
ntCData	'#cdata-section'
ntEntityRef	The name of the entity reference.
ntEntity	The entity name
ntProcessingInstr	the target of the processing instruction
ntComment	'#comment'
ntDocument	'#document'
ntDocType	The document type name
ntDocFragment	'#document-fragment'
ntNotation	The notation name?

Xml.XMLIntf.IXMLNode.NodeValue

Specifies the value of this node.

Use NodeValue to get or set the value of the node. The meaning of a node's value depends on the type of the node, as indicated in the following table:?

?

NodeTypeValue

ntAttribute	The attribute value
ntElement	If the element contains only text, this is that text value. Otherwise, trying to read or set NodeValue causes an exception.
ntText	The text
ntCData	The content of the CDATA section.
ntProcessingInstr	The content of the processing instruction except for the target.
ntComment	The value (text) of the comment.?

Xml.XMLIntf.IXMLNode.IsTextElement

Indicates whether the node has a single text value.

Read IsTextElement to determine whether this node represents a single text value. For example, if the node represents the following:?

?

<Title> Understanding XML </Title>

IsTextElement is true, because the node represents a tagged element and the text that is its value.

Note:?

In the underlying DOM implementation, nodes for which?IsTextElement?is true are element nodes that have a single child node that is a text node.?

IXMLNode?flattens this out so that you can use the element node to work with the text value (through the?Text?property),

rather than requiring you to use a separate node for the text value.

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