Derivatives and Integrals An Annotated Discourse

<worksheet>
  <title>Worksheet with both exercise and project</title>
  <exercise>
    <statement>
      <p>
        This is an exercise's statement.
      </p>
    </statement>
    <answer>
      <p>
        This is an exercise's answer.
      </p>
    </answer>
    <solution>
      <p>
        This is the exercise's solution.
      </p>
    </solution>
  </exercise>
  <project>
    <statement>
      <p>
        This is a project's statement.
      </p>
    </statement>
    <answer>
      <p>
        This is a project's answer.
      </p>
    </answer>
    <solution>
      <p>
        This is the project's solution.
      </p>
    </solution>
  </project>
</worksheet>