rougail/tests/dictionaries/88valid_enum_variable_optional/00-base.xml

<?xml version='1.0' encoding='UTF-8'?>
<rougail version="0.10">
  <variables>
    <family name="general">
      <variable name="mode_conteneur_actif" type="string" description="No change">
        <value>a</value>
      </variable>
      <variable name="var" type="string" description="New variable" multi="True">
        <value>a</value>
        <value>b</value>
        <value>c</value>
      </variable>
    </family>
  </variables>
  <constraints>
    <check name="valid_enum">
      <param type="variable" optional="True">var</param>
      <target>mode_conteneur_actif</target>
    </check>
  </constraints>
</rougail>