Exam 20: the Semantic Object Model

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A "composite object" cannot contain more than one multivalued attribute.

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

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A simple attribute has only one element.

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

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Subtype objects can be:

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

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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.

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The term "semantic" means:

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A hybrid object is a semantic object that contains at least one:

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What type of attribute has a single element?

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Object identifiers may or may not be unique.

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A version object:

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

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A "simple object" can contain only simple attributes.

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Explain the concept of semantic objects as being a "sufficient description."

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