Data type: NULL : No_information

Description of: NULL : No_information

A No Information MEI can occur in place where an MEI of any other MET is expected (except as otherwise stated in the standard, e.g. by a "mandatory-ness" constraint.) This is like a NULL in SQL but with the ability to specify a certain flavor of missing information.

Component definitions for: NULL : No_information

flavor :: CD

The flavor of the null value. Can be interpreted as the reason why the information is missing.