Attribute domain

From Wiki.GIS.com

It has been suggested that this article or section be merged into Attribute table. (Discuss)

In computing, the attribute domain is the set of values allowed in an attribute.

For example:

   Rooms in hotel (1-300)
   Age (1-99)
   Married (yes or no)
   Nationality (Sri Lankan, Indian, American, or British)

For the relational model it is a requirement that each part of a tuple to be atomic. The consequence is that each value in the tuple must be of some basic type, like a string or an integer. For the elementary type to be atomic it cannot be broken into more pieces. Alas, the domain is an elementary type, and attribute domain the domain a given attribute belongs to an abstraction belonging to or characteristic of an entity.