s="special">,</span>
        <span class="identifier">member_nameN</span><span class="special">,</span>
        <span class="identifier">key_typeN</span><span class="special">)</span></code>
        triples declares the type, name and key type of each of the struct members
        that are part of the sequence.
      </p>
<p>
        The macro should be used at global scope. Semantics of an expression is defined
        only where it differs from, or is not defined in <a class="link" href="../sequence/conce