how to create barcode in vb net 2012 The Document Object Model: Processing Structured Documents in Java

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The Document Object Model: Processing Structured Documents
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Common ancestor nodes
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Nodes aren t just limited to elements, such as <HEAD> and <TITLE> Everything in a document is represented as a node, including comments, attributes of elements, text content, XML processing instructions, document type declarations, and so on If it s in the document, it can be represented as a node The DOM API provides several interfaces in the Core module for manipulating nodes and inserting/extracting information to and from nodes There are also methods provided for determining and changing the relationships between nodes and discovering the type of a particular node
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DOM Node Types
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The DOM specification defines 12 different types of nodes that can be contained within a document Each type of node has a set of related attributes and capabilities associated with it The following table lists the different types of nodes available as of DOM Level 2 and provides a brief description of each type: Node Type
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Element
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Description
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Represents an element in an HTML or XML document, which is represented by tags In Figure 2-1, the <BODY> node is an Element type Represents an element s attribute For example, a tag with the syntax <img src="mypicturejpg"> has an Attribute node named src
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2: How the DOM Represents Structured Documents
Node Type
Text
Description
Represents the textual content of an element In Figure 2-1, the <B> node has a Text child node that represents the text, This is bold text! Represents a Character Data section in an XML document Represents a comment Comments are of the form <!-comment text --> Represents the root node of a document Each Document node has a DocumentType node that provides a list of entities defined in the document Document fragments can be thought of as lightweight or rather minimal Document nodes They came about because it is common to want to extract just a portion of a document for processing Represents a specific instruction to be used by the document processor It is used as a way of keeping processor-specific information in the document s content Represents an entity in an XML document Represents an entity reference in the document Represents a notation in an XML document Notations have no parent nodes
CDATASection Comment Document DocumentType DocumentFragment
ProcessingInstruction
Entity EntityReference Notation
Usually, your DOM programs will only need to manipulate the most important node types, which contain the actual content of the document: Document, Element, Comment, Attribute, CDATA, and Text The other node types are typically used to describe the format and structure of the information contained in a complex XML document
NOTE
Specific definitions of each of the node types and their syntax can be found in the W3C XML and HTML specifications; the detailed definition of each of these node types is beyond the scope of this book
Each node is allowed to have child nodes according to its node type Some types of nodes are not permitted to contain child nodes at all The following table lists the types of child nodes that each node type is allowed to have
The Document Object Model: Processing Structured Documents
Node Type
Document DocumentFragment DocumentType Element Comment Text Attribute EntityReference Entity CDATASection Notation
Allowable Child Node Types
Element (one at most), ProcessingInstruction, Comment, DocumentType Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference None Element, Text, Comment, ProcessingInstruction, CDATASection, EntityReference None None Text, EntityReference Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference None None
If a DOM program tries to assign a node as a child of another node that is not allowed to have a child node of the given type, then the DOM implementation will indicate an error condition by raising a DOMException
The Fundamental Core DOM Interfaces
In this section, we introduce the interfaces that are fundamental to manipulating information inside of a DOM document We will cover only the interfaces in this section that are related to working with documents that contain HTML and XML content The next section will cover the extended Core interfaces, which deal with the set of interfaces needed for working with XML-specific document structure elements We ll start by taking a look at the specific types of errors that can occur while working with the fundamental interfaces, and then introduce and walk through the basic Node interface Next, we ll examine some utility interfaces for working with ordered and unordered lists of nodes, and, finally, introduce the interfaces for specific node types In the next chapter, we ll use these interfaces to manipulate the contents of a DOM document
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