The spec for this action:
https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf#G11.2111850
An example of a form using this action:
https://www2.illinois.gov/rev/forms/reg/Documents/reg-1-mr.pdf
function parseOnOff(refs) {
      const onParsed = [];
      if (Array.isArray(refs)) {
        for (const value of refs) {
          if (!isRef(value)) {
            continue;
          }
          if (contentGroupRefs.includes(value)) {
            onParsed.push(value.toString());
          }
        }
      }
      return onParsed;
    }
    function parseOrder(refs, nestedLevels = 0) {
      if (!Array.isArray(refs)) {
        return null;
      }
      const order = [];
      for (const value of refs) {
        if (isRef(value) && contentGroupRefs.includes(value)) {
          parsedOrderRefs.put(value); 
          order.push(value.toString());
          continue;
        }