XML-XSLT

In continuation with the blog post on XML, there is an another method to extract data from a XML document, the method is XSLT. XSLT is Extensible Style Sheet Language with a Transformation. The XML document is fed to a XSLT processor along with the XSLT file, the XSLT file is applied on the XML document to produce the desired XMl document. A XSLT file has a set of match and replace commands, it is also possible to recursively match and replace using a XSLT file. An XSLT file helps one to produce a more user friendly XML document. In a XSLT file one can also perform loops and iterations which makes XSLT a powerful means of extracting data from a XML Document. Here is a sample XSLT file listed below:

<xsl:stylesheet xmlns:xs="http://www.w3.org/2001/XMLSchema"

xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
<xsl:output method="xml" indent="yes" omit-xml-declaration="yes" />

<xsl:template match="Textbook[@Price > 90]">
<xsl:copy-of select="."/>
xsl:template>

<xsl:template match="text()" />

<xsl:template match="NewsMagazine">
<xsl:copy-of select="."/>
xsl:template>

xsl:stylesheet>

A sample For each construct in XSLT:
<xsl:for-each select="countries/country">
      XSLT Commands...
xsl:for-each>

In the Kernow utility as mentioned in the Previous blog post on XML, one can work with XSLT and run transformations on XML in the XSLT Sandbox tab.