how to create barcode in vb net 2012 Inspecting Nodes in Java

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Using the example document represented by Listing 3-1 and illustrated in Figure 3-1, we can list the properties of the Node interface as they would be populated in a node reference for each of the four node types contained within the document Table 3-1 lists the values of the Node interface properties for the Document node Because the Document node is the root of the DOM structure, and because documents can have only one Document node, this node has no ownerDocument, previousSibling, nextSibling, or parentNode; thus they are all null
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Node Property
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ownerDocument previousSibling nextSibling parentNode firstChild lastChild nodeName nodeValue nodeType Table 3-1
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Value
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null null null null Element ("HTML") Element ("HTML") "#document" null 9 (Document node)
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Node Properties for the Document Node
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The Document Object Model: Processing Structured Documents
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In addition, the Node interface specifies that the nodeValue of a Document node is also null The Document node has one child, the HTML element, which means that the node s firstChild and lastChild are the same node The nodeType for a Document node is defined to be 9 Table 3-2 lists the values of the Node properties for the Element node represented by the <TITLE> tag The <TITLE> tag s ownerDocument is set to the document that owns this node It is the first child of the <HEAD> tag, so it has no previousSibling Its nextSibling property is the Comment node that follows it in the document; and because it is a direct descendant of the <HEAD> tag, it has the HEAD Element node as its parentNode It has only one child a Text node so its firstChild and lastChild properties are the same The nodeName property reflects the name of the tag that represents the node in this case, <TITLE> Element nodes, by definition, have no node value, so the nodeValue property is set to null The <TITLE> tag is an Element node, and its nodeType property reflects this with a value of 1 The TITLE node is an Element node, so it has one additional property specified by the Element interface: the tagName property, which is the same as nodeName ("TITLE") Table 3-3 lists the values of the Node interface properties for the Comment node The Comment node is immediately preceded by the TITLE element, causing the previousSibling property to contain a reference to the TITLE node There is no node after the comment, which is why the nextSibling property is null Node Property
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ownerDocument previousSibling nextSibling parentNode firstChild lastChild nodeName nodeValue nodeType Table 3-2
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Value
Document node null Comment node Element node ("HEAD") Text node Text node "TITLE" null 1 (Element node)
Node Properties for the <TITLE> Tag
3: Navigating and Manipulating Structured Documents
Node Property
ownerDocument previousSibling nextSibling parentNode firstChild lastChild nodeName nodeValue nodeType Table 3-3
Value
Document node Element node ("TITLE") null Element node ("HEAD") null null "#comment" "This is a comment" 8 (Comment node)
Node Properties for the Comment Node
Comments do not have child nodes, so the firstChild and lastChild properties are null Like the <TITLE> tag, the Comment has the <HEAD> tag as its parent (and thus, parentNode contains a reference to the HEAD element node) The nodeName of a Comment is "#comment", and the node s value is the text contained within the comment, not including the comment delimiters (<!-- and -->, respectively) The nodeType for a Comment node is 8 Comment nodes have additional properties, data and length, which are provided by the CharacterData interface that they derive from For a Comment node, the data property is the same as the nodeValue property The length property specifies the number of 16-bit units that comprise the character content of the comment (not the number of bytes!) Table 3-4 lists the values of the Node interface properties for the Text node represented by the text string "This is bold text", which is a child node of the <B> tag As with all the other nodes, the Text node s ownerDocument is set to the Document node for this document The Text node is the only child of the <B> tag, so its previousSibling and nextSibling properties are set to null Its parent is the <B> tag itself, as indicated by the parentNode property Text nodes are not allowed to have child nodes, so the firstChild and lastChild properties are both null The nodeName property for a Text node is defined by the W3C specification to be "#text", and the nodeValue property holds the text content of the node (in this case, "This is bold text") The nodeType for Text nodes is set to 3
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