XML Serialization Annotation This rule has the following XML serialization annotation: [ localname = "Group" children = ( meta*2 rule*4 ) ] This means that a Group derived through this rule will be serialized thus: <Group> <meta*> XML serialization of the 2nd RHS symbol (Meta_opt) </meta*> <rule*> XML serialization of the 4th RHS symbol (RuleSet_opt) </rule*> </Group> N.B.: an XML construct such as <meta*>...</meta*> stands for either zero, one, or many occurrences of <meta>...</meta>. distributed over the element's contents (the "..."), which, accordingly, may be either empty, a single XML element, or a list thereof.