2.2 Relationship To Other Models
The foregoing concepts are fundamental enough that they should find equivalents in any data repository. Some, perhaps approximate,
equivalents are given in the following table as a guide.
Table 2-1 Relationship to Other Models
RDF |
DAF |
Relational Model |
UML |
|
|
|
|
|
|
|
|
| Resource |
Resource, ResourceID |
Tuple (i.e., row) |
Object |
|
|
| Property |
Property, PropertyID |
Attribute (i.e., column) or foreign key |
Attribute or association |
|
|
| Class |
Class, ClassID |
Relation (i.e., table) |
Class |
|
|
| Resource Description |
ResourceDescription |
Tuple value |
- |
|
|
| URI |
URI, ResourceID |
Key value |
- |
|
|
| Value |
SimpleValue |
Field value |
- |
|
|
| Incomplete Information |
Absence of a requested Property-Value in a Resource-Description |
NULL value |
- |
|
|