34

Model No.				34
Short Citation				(Hohenstein et al. 1987)
Year				1987
Special Name
Descendant of				(Chen 1976)
Constructs	Inherent	Entity Type		r: objects, sg/l: complex objects, versions
		Relationship Type		sg/l: min/max, sg: derived
		Value Sets / Attributes		sg/l: key, role, multivalued, sg/l: optional, derived
	New	Invented	Adapted	integrity boxes, type construction
			Included
		Borrowed	Included
			Added
Syntactic Rules				(1) Integrity boxes are connected to entity types (relationship types, attributes). (2) Different input entity types are connected by type constructors to form separate output entity types [requirements].
Semantics				formal
Focus				g
Data Definition				l
Data Manipulation
Remarks
Cause	Citation			... [extended ERM] to be suited for the design of standard and non-standard applications ... (p. 59). ... integrate all important semantic concepts of recent semantic data models (p. 64). ... shall form the basis for several database and information systems design tools (p. 59).
	Content	Expressiveness		structure
		Applicability
		Correction
		Integration		X
		Implementation		X
		Other
Alternative Publications
Binary Vector	Structure/General	[E1]
		[E2]		1
		[E3]		1
		[E4]		1
		[E5]
		[E6]
	Structure/Integrity	[E7]		1
		[E8]		1
		[E9]		i
		[E10]		1
		[E11]		1
		[E12]		1
		[E13]		i
		[E14]		i
		[E15]		1
		[E16]		1
	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			0.45
	Data Model			0.83
	Application			0.00
	Domain Specifics			0.00
Partially Redundant Constructs	Conjunctive Concepts			J, T
	Linked Concepts			O