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The XML Document Object Design (DOM) includes methods that permit you to make use of XML Route Language (XPath) selection to question information in the D0M. You can make use of XPath to find a single, particular node or to discover all nodes thát match some criteria.
Oct 08, 2015 LLVM IR phi node with only one possible predecessor. If there is only one possible predecessor shouldn't the above be exactly the same as endcond.loopexit:; preds =%loop br label%endcond; res assigned a value in%loop endcond:%var = phi i64 %res,%endcond.loopexit. This document serves as a high level summary of the optimization features that LLVM provides. Optimizations are implemented as Passes that traverse some portion of a program to either collect information or transform the program.
XPath Select Methods
The DOM classes supply two strategies for XPath choice: the SelectSingleNode method and the SelectNodes technique. The SelectSingleNode method returns the very first node that fits the choice criteria. The SelectNodes technique comes back an XmlNodeList that contains the matching nodés.
Thé right after example uses the SelectSingleNode method to choose the initial
book
nodé in which thé author's last name satisfies the specified requirements. The bookstore.xml document (which is certainly offered at the end of this subject) is utilized as the insight document.The following example utilizes the SelectNodes technique to choose all the publication nodes in which the price is higher than a described amount. The price for each guide in the chosen list can be then programmatically reduced by ten pct. Lastly, the up to date file will be composed to the gaming console. The bookstore.xml file (which is certainly provided at the finish of this subject) is certainly utilized as the input file.
The illustrations above start the XPath query at the document element. Setting the beginning stage for the XPath concern sets the circumstance node, which will be the starting point for the XPath concern. If you perform not wish to start at the record component, but need to begin from the first child of the document component, you can code the select declaration as follows:
All XmlNodeList objects are coordinated with the underlying document. As a result, if you itérate through the nodé list and adjust the value of a nodé, that node will be also up to date in the document it emerged from. Notice in the prior illustration that when a node will be modified in the selected XmlNodeList the fundamental document can be also customized.
Notice
When the fundamental document will be modified, it is wise to rerun thé select. If thé node customized will be one that could result in the node to end up being added to the node list when it had been not previously, or would right now trigger it to become taken out from the node list, there will be no assurance that the node listing is now accurate.
Naméspaces in XPath Movement
XPath expressions can include namespaces. Namespace quality is backed making use of the XmlNamespaceManager. lf the XPath expression contains a prefix, thé prefix and naméspace URI pair must be added to the XmINamespaceManager, and the XmINamespaceManager will be transferred to the SelectNodes(Line, XmlNamespaceManager) or SelectSingleNode(Line, XmlNamespaceManager) technique. Observe that the program code examples above make use of the XmlNamespaceManager to resolve the namespace óf the bookstore.xmI record.
Note
lf the XPath appearance does not include a prefix, it is presumed that the namespace Uniform Reference Identifier (URI) can be the clear namespace. If your XML consists of a default naméspace, you must still include a prefix ánd namespace URI tó the XmlNamespaceManager; in any other case, no nodes will become selected.
![Phinode :: create Phinode :: create](/uploads/1/2/5/8/125836631/779461472.png)
Input File
The sticking with can be the bookstore.xml file that is usually used as the input document in the examples in this topic: