A simplified structure of the relational taxonomic database. The boxes illustrate the tables of the database, and the lines present the relations between them. LSIDs are given to taxonomic concepts and scientific names (illustrated with a darker colour). Taxonomic concepts are linked to each other using the relations described in Table 3 and each concept is linked to a scientific name. External LSIDs and common names are connected to the concepts. An author reference, validity, and a taxonomic rank are assigned to the scientific names.