Chapter 3 Building Conceptual and Logical Diagrams

Conceptual diagram objects

You can create the following objects in a conceptual diagram:

Object	Tool	Symbol	Description
Domain	[none]	[none]	Set of values for which a data item is valid. See "Domains (CDM/LDM/PDM)" in the Building Physical Diagrams chapter.
Data Item	[none]	[none]	Elementary piece of information. See Data Items (CDM).
Entity			Person, place, thing, or concept that is of interest to the enterprise. See Entities (CDM/LDM).
Entity Attribute	[none]	[none]	Elementary piece of information attached to an entity. See Attributes (CDM/LDM).
Identifier	[none]	[none]	One or many entity attributes, whose values uniquely identify each occurrence of the entity. See Identifiers (CDM/LDM).
Relationship			Named connection or relation between entities (ER modeling methodology). See Relationships (CDM/LDM).
Inheritance			Relationship that defines an entity as a special case of a more general entity. See Inheritances (CDM/LDM).
Association			Named connection or association between entities (Merise modeling methodology). See Associations and Association Links (CDM).
Association Link			Link that connects an association to an entity. See Associations and Association Links (CDM).

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