i:option(Value, "HnaInterval").optional = true
i:option(Value, "HnaValidityTime").optional = true
+ip6t = i:option(ListValue, "Ip6AddrType")
+ip6t:value("auto")
+ip6t:value("site-local")
+ip6t:value("unique-local")
+ip6t:value("global")
+ip6t.optional = true
+
adc = i:option(Flag, "AutoDetectChanges")
adc.enabled = "yes"
adc.disabled = "no"