ne Variable Parameter</a>

<h2>Macro definitions</h2>
The macro to be used in the matching routine can be defined in two ways:
<ul>
  <li>
  using USE_MACRO statement:
  <pre> USE_MACRO, NAME=macro1;
  </pre></li>
  defining a new macro on the fly using the usual syntax for <a href="../control/special.html#macro"> macros</a>.
</ul>
After a macro definition is necessary to define a set of constraints exclusively with the following syntax:
<pre> CONSTRAINT, expr=  "lhs = rhs"; </pre>
or 
<pre> C