Internet Archaeol 15. Nick Ryan. List of Figures

Figure 1: The components of a relation (table).

Figure 2: Relationships between relations (tables). The Layer attribute in the FINDS table acts as a foreign key to the LAYERS table.

Figure 3: A simple Entity-Relationship (ER) diagram representing part of the design for an excavation database.

Figure 4: A relational database implementation of the ER diagram in Figure 3. Primary keys are shown underlined, foreign keys in italic.

Figure 5: A simple UML class diagram illustrating inheritance.

Figure 6: Outline architecture of a 3-tier Web-based data access system.

Figure 7: Outline architecture of the ADS Historic Environment Portal.