7
DOMAINS, MAPPINGS, AND ENTERPRISE REFERENCE DATA
Because a data type is assigned to each data attribute in a database table, it draws its values from a specific value set. The same goes for information embedded in a transmitted message: The value in each field in the message should conform to the expected type for that field. In a way, it is taken for granted that any value stored in a field is taken from a value class (or set) that has some structural (or syntactic) rules as well as some explicit connotative (or semantic) rules that govern the correctness or validity of those values. Either way, these expectations actually boil down into a set of restrictions on the values that the attribute may take.
The syntactic rules cover restrictions ...
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