!2 ''!-SubsetFixture-!'' can check for none (although it's not much use)
|!-fitlibrary.specify.SubsetFixtureUnderTest-!|
|+|&|

!|fitlibrary.spec.SpecifyFixture|
|!-<table border="1" cellspacing="0">
<tr><td colspan="2">fitlibrary.specify.SubsetFixtureUnderTest</td></tr>
<tr><td>+</td><td>&amp;</td></tr>
</table>-!|!-<table border="1" cellspacing="0">
<tr><td colspan="2">fitlibrary.specify.SubsetFixtureUnderTest</td></tr>
<tr><td>+</td><td>&amp;</td></tr>
</table>-!|