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Analysis and Design
Value Sets (domain) of Attributes
Each attribute of an entity type is associated with a value set. This value
set is also called domain. The domain of an attribute is the collection of all
possible values an attribute can have.
The value set specifies the set of values that may be assigned for each individual
entity. For example, we can specify the value set for designation attribute as
<“PM”, “Assit”, “DM”, “SE”>.
We can specify “Name” attribute value set as <strings of alphabetic
characters separated by blank characters>. The domain of Name is a character
string.
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