ER Models | ERM References | ERM Anthologies |
Model No. | 19 | |||
Short Citation | (Elmasri et al. 1985) | |||
Year | 1985 | |||
Special Name | ECR (Entity-Category-Relationship) | |||
Descendant of | (Chen 1976) | |||
Constructs | Inherent | Entity Type | r/sg: category, generalization/subset category | |
Relationship Type | sg/l: min/max-participation, sg: total/partial/functional participation (derived) | |||
Value Sets / Attributes | sg/l: compound, multivalued, role, d: identifier | |||
New | Invented | Adapted | ||
Included | ||||
Borrowed | Included | |||
Added | ||||
Syntactic Rules | X | |||
Semantics | formalized | |||
Focus | g | |||
Data Definition | e | |||
Data Manipulation | l | |||
Remarks | ||||
Cause | Citation | ... [ER model] not sufficient to represent some important data semantics (p. 77). | ||
Content | Expressiveness | structure | ||
Applicability | ||||
Correction | ||||
Integration | ||||
Implementation | ||||
Other | ||||
Alternative Publications | ||||
Binary Vector | Structure/General | [E1] | ||
[E2] | 1 | |||
[E3] | i | |||
[E4] | f | |||
[E5] | f | |||
[E6] | f | |||
Structure/Integrity | [E7] | 1 | ||
[E8] | 1 | |||
[E9] | f | |||
[E10] | 1 | |||
[E11] | 1 | |||
[E12] | 1 | |||
[E13] | i | |||
[E14] | i | |||
[E15] | 1 | |||
[E16] | ||||
Behavior | [E17] | f | ||
[E18] | f | |||
Application | [E19] | |||
[E20] | ||||
[E21] | ||||
[E22] | ||||
[E23] | ||||
[E24] | ||||
[E25] | ||||
[E26] | ||||
[E27] | ||||
Domain-Specifics | [E28] | |||
[E29] | ||||
[E30] | ||||
[E31] | ||||
[E32] | ||||
[E33] | ||||
Expressiveness Values | Total | 0.48 | ||
Data Model | 0.89 | |||
Application | 0.00 | |||
Domain Specifics | 0.00 | |||
Partially Redundant Constructs | Conjunctive Concepts | S, J, T | ||
Linked Concepts |