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  Tutorial: Practical JSTL, Part 2

the basic idea behind the JSP Standard Tag Library (JSTL) and the powerful standard actions that are provided within it. We had an overview of the functionality of the Core tag library,you can use the Expression Language (EL). In part 2, we\'ll take a l

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The XML tag library brings us to actions that deal with XML manipulations. I am hardput to think of any application that I\'ve developed in the last few years that didn\'t use XML to represent the data in the web tier. XML is the data format of choice for exchanging information. Keeping this in mind, it\'s relevant to discuss the number of actions that JSTL provides to help a page author deal with XML. You will find a strong similarity between the XML core actions and the actions provided in the Core tag library. But there is a difference; the XML core actions use XPath for their expression language.
All of the XML actions of JSTL allow a way to specify XPath expressions. This is accomplished by using the select attribute. The select attribute is always specified as a string literal that is evaluated by the XPath engine. It was decided to have a dedicated attribute for XPath expressions so as to avoid confusion. Since some of the XML actions have similar functions to the Core actions, it was important not to get the XPath expression confused with the JSTL expression language. The select attribute is shown in this simple sample where the XPath expression specifies the title to be selected from the XML document and output to the JspWriter


 

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Practical JSTL, Part 2

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