ER ModelsERM ReferencesERM Anthologies
Model No.65
Short Citation (Thalheim 2000)
Year 1991
Special Name HERM+
Descendant of
ConstructsInherent Entity Type sg: cluster, weak
Relationship Type sg: min/max
Value Sets / Attributes sg: nested, key
NewInventedAdaptedintegrity constraints, operations, type construction
Included
BorrowedIncluded
Added
Syntactic Rules (1) Relationships connect relationships. (2) Integrity constraints/operations are connected to entity or relationship types.
Semanticsformal
Focus t
Data Definition l
Data Manipulation l
Remarks
CauseCitation[HERM] ... has a strong theoretical basis (p. 9). The modeling is more natural and can be applied in a simple manner (p. 9). The theory is applicable to practical needs (p. 10). The results of the design are much simpler than with other approaches (p. 10). The model is easy to understand, simple and comprehensible (p. 11). The model is capable to support sophisticated database design techniques (p. 11).
ContentExpressiveness
ApplicabilityX
CorrectionX
IntegrationX
ImplementationX
Other
Alternative Publications (Thalheim 1999)
Binary Vector Structure/General [E1] 1
[E2] 1
[E3] 1
[E4] 1
[E5] 1
[E6] 1
Structure/Integrity [E7] 1
[E8] 1
[E9] 1
[E10] 1
[E11] 1
[E12] 1
[E13] i
[E14] i
[E15] 1
[E16] 1
Behavior [E17] 1
[E18] 1
Application [E19]
[E20]
[E21]
[E22]
[E23]
[E24]
[E25] 1
[E26]
[E27]
Domain-Specifics [E28]
[E29]
[E30]
[E31]
[E32]
[E33]
Expressiveness Values Total 0.58
Data Model 1.00
Application 0.11
Domain Specifics 0.00
Partially Redundant Constructs Conjunctive Concepts S
Linked Concepts
Copyright(a) Susanne Patig, 2005