ummary="Important">
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="../../images/important.png"></td>
<th align="left">Important</th>
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<tr><td align="left" valign="top"><p>
          In the attribute tables, we will use <code class="computeroutput"><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;</span></code> and <code class="computeroutput"><span class="identifier">tuple</span><sp