how to create barcode in vb net 2012 XPath Support in DOM Level 3 in Java

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XPath Support in DOM Level 3
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The DOM XPath Module specifies six interfaces for working with XPath expressions within DOM documents Table 11-3 lists the interfaces and their purpose The main interfaces used in evaluating XPath expressions are the XPathEvaluator, XPathExpression, and XPathResult To evaluate a DOM XPath expression relative to a given node, applications use the XPathEvaluator interface to create a parsed and compiled XPathExpression either by calling createExpression() or by calling the evaluate() method directly to evaluate an XPath expression contained within a DOMString According to the DOM spec, the XPathEvaluator interface is expected to be available on the same object that provides the Document interface for a given implementation The result of the expression is returned as an XPathResult
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11: Future Directions for the DOM
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Interface
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XpathException XpathEvaluator XpathExpression XPathNSResolver XpathResult XpathNamespace
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Defines new exception codes for exceptions raised when working with XPath expressions Provides evaluation of XPath expressions Represents both parsed and resolved XPath expressions Resolves namespaces by permitting prefix strings to be bound to namespaceURI strings Represents the result of the evaluation of an XPath expression when it has been evaluated within the context of a certain node Because the DOM does not provide the necessary namespace nodes that XPath requires, this interface is returned by the XPathResult interface to represent such a namespace node For more information, see the DOM Level 3 XPath module specification
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Table 11-3
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The DOM XPath Interfaces
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The XPathEvaluator interface has the following IDL definition:
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interface XPathEvaluator { XPathExpression createExpression(in DOMString expression, in XPathNSResolver resolver) raises(XPathException, DOMException); XPathNSResolver createNSResolver(in Node nodeResolver); XPathResult evaluate(in DOMString expression, in Node contextNode, in XPathNSResolver resolver, in unsigned short type, in XPathResult result) raises(XPathException, dom::DOMException); };
The evaluate() method is used to directly evaluate XPath expressions given in string form The expression argument contains the XPath expression to be evaluated The contextNode argument represents the document node that will serve as the context node with respect to which the expression will be evaluated The resolver argument translates any prefixes within the XPath expression into appropriate namespace URIs (this argument can be specified as null if no namespaces are to be used) The type argument allows the caller to specify the type of result desired If possible, the XPath result will be coerced into the specified type, which should be one of the
The Document Object Model: Processing Structured Documents
type codes listed in the XPathResult interface The result argument is provided so that any previously returned XPathResult may be reused The createNSResolver() method uses the node in the given nodeResolver argument to resolve namespaces by calling the lookupNamespacePrefix() method on the node Sometimes, it is more convenient for performance reasons to compile an XPath expression that will be reused within an application because the expression can be compiled into a more efficient internal representation In addition, any needed namespace resolution can be done at this point The createExpression() method allows an application to create an XPathExpression object that represents a compiled expression The XPathExpression interface has the following IDL definition:
interface XPathExpression { XPathResult evaluate(in Node contextNode, in unsigned short type, in XPathResult result) raises(XPathException, dom::DOMException); };
The XPathExpression interface contains one method, evaluate(), which performs the same function as the evaluate() method in the XPathEvaluator interface The XPathResult interface represents the result of an evaluated XPath expression It has the following IDL definition:
interface XPathResult { // XPathResultType const unsigned short const unsigned short const unsigned short const unsigned short const unsigned short const unsigned short const unsigned short const unsigned short const unsigned short const unsigned short
ANY_TYPE NUMBER_TYPE STRING_TYPE BOOLEAN_TYPE UNORDERED_NODE_ITERATOR_TYPE ORDERED_NODE_ITERATOR_TYPE UNORDERED_NODE_SNAPSHOT_TYPE ORDERED_NODE_SNAPSHOT_TYPE ANY_UNORDERED_NODE_TYPE FIRST_ORDERED_NODE_TYPE resultType; numberValue;
= = = = = = = = = =
0; 1; 2; 3; 4; 5; 6; 7; 8; 9;
readonly attribute unsigned short readonly attribute double
11: Future Directions for the DOM
// raises(XPathException) on retrieval readonly attribute DOMString stringValue; // raises(XPathException) on retrieval readonly attribute boolean booleanValue; // raises(XPathException) on retrieval readonly attribute Node singleNodeValue; // raises(XPathException) on retrieval readonly attribute boolean invalidIteratorState; readonly attribute unsigned long snapshotLength; // raises(XPathException) on retrieval Node iterateNext() raises(XPathException, dom::DOMException); Node snapshotItem(in unsigned long index) raises(XPathException); };
The first ten constant values represent the possible types of an XPathResult, which can be accessed via the resultType property Table 11-4 lists the possible constant values along with the meaning of each
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