Constants

The design file allow the user to define constants that will be used as built-in variables:

<constants>
	<constant>
		<name>myconstant</name>
		<value>200</value>
	</constant>
</constants>

Then, you can use the constant anywhere in the design file:

	<parameter>
		<name>max</name>
		<value>${myconstant}</value>
	</parameter<