Explanation

• Nodes:
  • Rectangular nodes represent entities.
  • Diamond nodes represent relationships.
  • Oval nodes represent attributes.
  • Exclamation marks close attributes that comprise an entity or relationship’s primary key.
  • Question marks close attributes that are optional.
  • Double borders indicate that an entity or relationship may be associated with one or more RDF triples.
• Edges:
  • Edges define the structure.
  • Solid edges connect relationships to their component entities and are labelled with the cardinality of the relationship for each component entity.
  • Arrowed edges point to entities that are defined weakly, which is to say that their primary keys include the primary keys of the other entities in the relationship (see Pin-Shan Chen 1976).
  • Bold edges indicate relationships of an entity with itself and are labelled with both relevant cardinalities.
  • Dotted edges connect entities and relationships to their attributes.
• Colours:
  • Colours give information related to the serialisation.
  • Dark brown designates entities and relationships that appear in Feature Description files only.
  • Medium brown designates entities and relationships that appear in Feature Description and Feature Value files.
  • Light brown designates entities and relationships that appear in Feature Value files only.
  • Light grey designates entities and relationships that appear in Feature Value and Instance Label files.
  • Light blue-green designates entities and relationships that appear in Instance Label files only.
  • Medium blue-green designates entities and relationships that appear in Instance Label and Class Ontology files.
  • Dark blue-green designates entities and relationships that appear in Class Ontology files only.

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