TCC - MINUS complex query example

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I'm looking for an example of the MINUS operator for a TCC export.  The syntx included in the User Guide does not seem quite right.  Thanks in advance.

<minus alias="testMinus">

  <queries>

    <query alias="candidate" projectedClass="com.taleo.akirademo.entity.Candidate">

      <projections>

        <projection alias="entityKey" tag="entityKey">

          <key path=""/>

        </projection>

      </projections>

      <filterings>

        <filtering>

          <matches>

            <field path="firstName"/>

            <string>a*</string>

          </matches>

        </filtering>

      </filterings>

    </query>

    <query alias="candidate2" projectedClass="com.taleo.akirademo.entity.Candidate">

      <projections>

        <projection alias="entityKey" tag="entityKey">

          <key path=""/>

        </projection>

      </projections>

      <filterings>

        <filtering>

          <matches>

            <field path="firstName"/>

            <string>s*</string>

          </matches>

        </filtering>

      </filterings>

    </query>

  </queries>

</minus>