Chapter 21: Problem 3

Describe the built-in structured literals of the ODMG Object Model and the operations of each.

Short Answer

Expert verified

Structured literals in the ODMG Object Model involve atomic, collection, structure and the nil literal. Operations that can be performed on these literals depend on their type. For instance, addition or subtraction can be performed on an atomic literal of type number, elements can be added or removed in collection literals, value associated with a key can be retrieved or set in a structure literal, and the nil literal can be used to represent absence of a value.

Step by step solution

Understand ODMG Object Model

The ODMG Model is a set of standards developed by the Object Data Management Group (ODMG). These standards cover the creation, deletion, modification and retrieval of objects stored in a compliant database management system. The primary goal of the ODMG is to provide standard interfaces that allow a single application to access different ODBMSs without any significant changes to the application code.

Describe the structured literals

The built-in structured literals of the ODMG Object Model include the following: atomic, collection, structure and the nil literal. Atomic: These are indivisible literals and include number, boolean, characters and time. Collection: Those literals which include a group of objects. They are set, list, bag and array. Structure: These include named literals in a structure, essentially key value pairs. The nil literal: This represents the absence of a value.

Describe the operations of each structured literal

Atomic - In atomic literals, common operations vary based on type, but can include operations such as addition and subtraction for numbers, equality checks for booleans, and similar. Collection - Operations on collections would typically involve adding elements, removing elements, and checking if an element is part of the collection. Structure - Operations for structures typically involve retrieving the value associated with a given key, and setting the value for a given key. The nil literal - The nil literal represents absence of a value and thus, it doesn't have any associated operations.

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Describe the built-in structured literals of the ODMG Object Model and the operations of each.

Short Answer

Step by step solution

Understand ODMG Object Model

Describe the structured literals

Describe the operations of each structured literal

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