Exam 22: the Semantic Object Model

Semantic objects represent the user's perceptions more closely than the E-R model.

A semantic object must represent something with a physical existence.

Group attributes are composites of other attributes.

Distinguish between the physical description and the semantic description of an attribute domain.

The key of an attribute is a description of an attribute's possible values.

The first attribute of a subtype object is the childID attribute.

A parent object is also known as a(n)________.

The cardinalities of an attribute operate only between the attribute and the container of the attribute.

A "hybrid object" is a semantic object that relates two or more objects and stores data that are peculiar to that relationship.

A composite object is a semantic object that contains ________.

What type of attribute is composed of other attributes?

An object identifier is one or more attributes that the users employ to identify object instances.

What type of attribute has a single element?

Whether a developer uses an E-R model or a semantic object model,the eventual database design that is created should be exactly the same.

Explain the differences between the E-R model and the semantic object model.