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XQuery
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1. How many countries are in the Mondial file?
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2. Which is the country with the smallest population in Europe?
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3. Return an alphabetically sorted list of all continents, where a
   continent element has an attribute "name" and no other content.
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4. Extend the previous query such that also the number of countries on
   a continent is returned.
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5. Modify the previous query so that it returns the continents in
   alphabetical order and, for each continent, the name of the country
   with the largest population and the population of that country.
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6. Return an alphabetically ordered list of religions, together with
   the number of members of that religion.
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7. Refine the previous query so that for each religion the total
   number of members is given as well as the number on each continent,
   provided the number is not 0.
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8. Return for each continent the names of those organizations, where
   the name of the continent is contained in the name of the
   organization.
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XSLT
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1. Write a script that returns a list of all cities in the document,
   ordered alphabetically.

   Each city element in the result will contain the name of the city
   and the name of the country to which it belongs, but no other
   information. Note that the cities in a country are not always
   immediately below the country element but may as well be nested
   in a province element.
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2. Write a script that returns a list of all cities in the document
   for which the last population count was greater than 100,000.

   (Note that some cities have no population elements while others
   have more than one, if data are available for several years.) Each
   city element in the result will contain the name of the city, the
   last population number, and the name of the country to which it
   belongs, but no other information. The cities will be ordered
   according to the population number, in descending order. Cities
   with identical population will be ordered alphabetically.
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