title: Set requirement on the axis
body: <p>In MDX, I've read that the <code>SELECT</code> clause selects <strong>sets</strong> on up to N axes. What about the following queries then that still work?</p>
  <pre><code>SELECT
      [Measures].[Count] -- no set specified here?
  FROM
      [Mycube]
  </code></pre>
  <p>Or:</p>
  <pre><code>SELECT
      [Measures].[Count],
      (Conference.Conference.members, Division.Division.members) -- a tuple?
  FROM
      [Mycube]
  </code></pre>
  <p>Why are both of the above 'ok' then?</p>