ONSTRAINT, expr=  "lhs < rhs"; </pre>
or 
<pre> CONSTRAINT, expr=  "lhs > rhs"; </pre>

where "lhs" and "rhs" are well defined MadX <a  href="../Introduction/expression.html">expressions</a>.

Other set of macro and constraints can be defined afterwards.


<h2>Examples</h2>
The following example the USE_MACRO mode can emulate a matching script which uses the normal syntax.

<br>Normal syntax:
<pre>
MATCH,SEQUENCE=LHCB1,LHCB2;
    VARY, NAME=KSF.B1, STEP=0.00001;
    VARY, NAME=KSD.B1, STEP=0