Chapter 3 Building Conceptual and Logical Diagrams
You can create the following objects in a logical 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. |
| 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). |
| n-n Relationship | 
|
|
[LDM only] Named cardinality represented with an intermediary entity. See Relationships (CDM/LDM). |
| Inheritance | 
|
|
Relationship that defines an entity as a special case of a more general entity. See Inheritances (CDM/LDM). |
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