ests having all three of the categories assigned
	<dt>A+B|C
	<dd>Selects tests with both A and B OR with category C.
	<dt>A+B-C
	<dd>Selects tests with both A and B but not C.
	<dt>-A
	<dd>Selects tests not having category A assigned
	<dt>A+(B|C)
	<dd>Selects tests having both category A and either of B or C
</dl>
<p>The comma operator is equivalent to | but has a higher precendence. Order
of evaluation is as follows:
<ol>
<li>Unary exclusion operator (-)
<li>High-precendence union operator (,)
<li>Intersec