<leafNode name="mtu"> <properties> <help>Maximum Transmission Unit (MTU)</help> <valueHelp> <format>68-1500</format> <description>Maximum Transmission Unit</description> </valueHelp> <constraint> <validator name="numeric" argument="--range 68-1500"/> </constraint> <constraintErrorMessage>MTU must be between 68 and 1500</constraintErrorMessage> </properties> </leafNode>