Logical Data Modeling - Scope

1 - About

The scope is a (depth|level) of a namespace

3 - Example

4 - Uniqueness

In a specific scope, only one primary element with the same primary key can exist.

Example:

  • In a file system, in a specific directory, you can't have two file with the same name.
  • In a table, you can't have two rows with the same primary key.

5 - Type

5.1 - Global

The global scope is the root of the namespace.

Example:

  • the root directory for a file system
  • the root catalog for a database system

5.2 - Local

The local scope is the namespace attached to a primary element (entity or relationship)

Example:

  • the directory where the file is located
  • a table for a row
  • a ldap domain for a user

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