Integrity rules The permissible range or set of
values must be clear for each data element. These
integrity rules add to the meaning of data conveyed
by data definitions and names. For example, a data
element of region is probably limited to some set of
valid values based upon sales territories or some
other artificial construct. In addition, a central and
single standard for valid values can be used by those
developing all data capture applications to detect
mistakes. Also, because exceptions might be permitted,
the integrity rules might specify who can
authorize deviations or under what circumstances
values outside of the valid set can be authorized.