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<p><i>These exercises are a bit more difficult overall than the Course-Catalog XPath and XQuery Exercises. We suggest you work those problems first.</i> <br /> <br /> In these exercises, you will be working with a small XML data set about world countries. This data is adapted from the Mondial 3.0 database as hosted by the <a href="http://www.cs.washington.edu/research/xmldatasets/www/repository.html#mondial">University of Washington</a>, and was originally compiled by the <a href="http://www.dbis.informatik.uni-goettingen.de/Mondial/">Georg-August University of Goettingen Institute for Informatics</a>. Each country has a name, population, and area (in sq. km). Some countries also list languages (with percentages of the population that speaks each language) and/or cities (with names and populations). The XML data is <a href="https://prod-c2g.s3.amazonaws.com/db/Winter2013/files/countries.xml" target="_blank">here</a>. <br /> <br /> <b>Instructions:</b> Each problem asks you to write a query in XPath or XQuery. When you click "Check Answer" our back-end runs your query against the sample database using Saxon. It displays the result and compares your answer against the correct one. When you're satisfied with your solution for a given problem, click the "Submit" button to check your answer. <br /> <br /> You may perform these exercises as many times as you like, so we strongly encourage you to keep working with them until you complete the exercises with full credit.</p>
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