ER ModelsERM ReferencesERM Anthologies
Model No.44
Short Citation (Embley/Ling 1990)
Year 1989
Special Name E2R (E-squared-R)
Descendant of (Chen 1976)
ConstructsInherent Entity Type sg: lexical, non-lexical
Relationship Type sg: functionally dependent, participation, union/partition generalization/specialization, sg/l: min/max
Value Sets / Attributes sg: composite, sg/l: role
NewInventedAdapted
Included
BorrowedIncluded
Added
Syntactic Rules X
Semanticsinformal
Focus g
Data Definition e
Data Manipulation
Remarksnormalized EER models
CauseCitation... capture a wider range of design-dependent real-world semantics (p. 111). ... improved, synergistic database design methodology (p. 111). ... design work cannot be completed in the ER model alone (p. 112).
ContentExpressiveness
Applicability
Correction
Integration
ImplementationX
Other
Alternative Publications
Binary Vector Structure/General [E1]
[E2] 1
[E3] i
[E4]
[E5]
[E6]
Structure/Integrity [E7] 1
[E8] 1
[E9] i
[E10] 1
[E11] 1
[E12] 1
[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 0.30
Data Model 0.56
Application 0.00
Domain Specifics 0.00
Partially Redundant Constructs Conjunctive Concepts S, J, T
Linked Concepts
Copyright(a) Susanne Patig, 2005