| Model No. | 43 |
|
Short Citation
| (Elmasri/Navathe 2000) |
|
Year
| 1989 |
|
Special Name
| EER (Enhanced ER) |
|
Descendant of
| (Chen 1976) |
| Constructs | Inherent |
Entity Type
| sg: weak, subclass, superclass, category |
|
Relationship Type
| sg/l: cardinality, sg: total participation, identifying, disjoint/overlapping total/partial specialization, aggregation |
|
Value Sets / Attributes
| sg: composite, multivalued, derived, key, sg/l: role |
| New | Invented | Adapted | |
| Included | |
| Borrowed | Included | |
| Added | |
|
Syntactic Rules
| X |
| Semantics | formalized |
|
Focus
| g |
|
Data Definition
| e |
|
Data Manipulation
| e |
| Remarks | |
| Cause | Citation | ... To represent these requirements [of newer applications] as accuratly and clearly as possible.... ... the ER model can be enhanced to include these concepts [of semantic data models] .. (p. 73) |
| Content | Expressiveness | structure |
| Applicability | X |
| Correction | |
| Integration | X |
| Implementation | |
| Other | |
|
Alternative Publications
| |
|
Binary Vector
| Structure/General |
[E1]
| 1 |
|
[E2]
| 1 |
|
[E3]
| 1 |
|
[E4]
| |
|
[E5]
| |
|
[E6]
| |
| Structure/Integrity |
[E7]
| 1 |
|
[E8]
| 1 |
|
[E9]
| f |
|
[E10]
| 1 |
|
[E11]
| i |
|
[E12]
| a |
|
[E13]
| i |
|
[E14]
| i |
|
[E15]
| |
|
[E16]
| |
| Behavior |
[E17]
| |
|
[E18]
| |
| Application |
[E19]
| |
|
[E20]
| |
|
[E21]
| |
|
[E22]
| |
|
[E23]
| |
|
[E24]
| |
|
[E25]
| |
|
[E26]
| |
|
[E27]
| |
| Domain-Specifics |
[E28]
| |
|
[E29]
| |
|
[E30]
| |
|
[E31]
| |
|
[E32]
| |
|
[E33]
| |
| Expressiveness Values |
Total
| 0.33 |
|
Data Model
| 0.61 |
|
Application
| 0.00 |
|
Domain Specifics
| 0.00 |
| Partially Redundant Constructs |
Conjunctive Concepts
| W, S, J,T |
|
Linked Concepts
| H |
Copyright(a) Susanne Patig, 2005