The following conventions are used in the manual ... (insert details
XML definitions are annotated with BNF-style markers to indicate
alternative (|), multiples (* or +), and optional (?) items. If no
annotation is present then the item must be present once.
- Indicates an alternative option. Only one of the items
separated by | is to be chosen.
- Following an item, * indicates the item
may occur any number of times, including no times (0 or more
- Following an item, + indicates the item
must occur at least once, but may occur more than ones (1 or
- Following an item, ? indicates the item
may occur at most once, if present (0 or 1 times).