This studio covers XSLT and XPath.
In the unlikely possibility that you have forgotten some of this material, the studio follows the w3schools tutorial pretty closely. The links are http://www.w3schools.com/xpath/default.asp and http://www.w3schools.com/xsl/default.asp
Download this xml program
http://www.cs.rpi.edu/~ingallsr/Countries.xml
Create an XSL stylesheet and link it to the XML document This stylesheet should display the country data in an HTML table with these headings:
Country, Language, Population, Life Expectancy, Density
and the appropriate data for each country (Life Expectancy is all genders).
The rows should be sorted in ascending order by Life Expectancy, and
the life expectancy and population density data should be right justified.
Density is population divided by area. This should be rounded to the
nearest whole number (the Xpath division operator is
div and XPath has a round function).