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When a data value can be defined as a pre-determined sequence of
characters, or optional characters, or data names (for which the
definition is also available), it is specified as a construction.
The rules of construction conform to the the regular expression
(REGEX) specificatiopns detailed in the IEEE document P1003.2
Draft 11.2 Sept 1991 (ftp file '/doc/POSIX/1003.2/p121-140').
Resolved data names for which _item_type_list.construct
specifications exist are replaced by these constructions,
otherwise the data name string is not replaced.
typical construction for _date
{_year}-{_month}-{_day}