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Describing Relationships and Structures (Chap 5) (Semantic Perspective…
Describing Relationships and Structures (Chap 5)
Semantic Perspective
Explains why the resources are related
Commonly expressed with a predicate
Use a triple e.g. subject - predicate-object
Inclusion - relationships between resources
Class inclusion
is-a or is-a-type-of
A set of interconnected class inclusion relationships creates a hierarchy - Taxonomy
Classification - is a class inclusion relationship between an instance and a class
meronymic inclusion
is-part-of or is-partly
Component-Object
Member-collection
Portion-Mass
Stuff-Object
Place-Area
Feature-Activity
Phase-Activity
Topological inclusion
is-in
Attribution - assign values to properties for a particular resource
Possession
HAS
Important to support interaction of ownership, control and transfer of ownership
Properties
Symmetry - relationship often only holds one way
Architectural Perspective
The number and abstraction level of the components of a relationship
Degree
Number of entity types or categories
of resources in the relationship
Most are binary
Cardinality
The number of instances that can be associated with each entity type in a relationship
One-to-many relationship
Directionality
the order in which the arguments of
the relationship are connected
All Symmetric relationships are bi-directional