Data Item _item_type_list.construct
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General 
- Item name
- _item_type_list.construct
- Category name
- item_type_list
- Attribute name
- construct
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
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) specifications 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.
Item Example
{_year}-{_month}-{_day}
Data Type 
- Data type code
- text
- Data type detail
- Text which may span lines
- Primitive data type code
- char
- Regular expression
- .*