The registry is based on UML (Unified Modeling Language), so it will be best understood by those familiar with UML. However, the individual items generally have plain text descriptions, and are arranged in a simple hierarchy, so the registry should also be fairly communicative to those without detailed UML knowledge. The organisational structure of the registry, and some of the detailed terms, come from the ISO 14817 standard. Knowledge of this standard is helpful, although much of the knowledge that is required can be found on this site.

Registry Structures

The registry provides several top level structures with which to access its content:

Registered Items
The home of all registered items, organised by the registry status level achieved (card, draft, recorded, qualified, preferred)

Core Components
Through harmonisation, explains the similarities and differences between models.

Subject Matter Index
One of the most useful ways to access the registry if you are interested in a particular kind of content, rather than a particular system.

System Interface Index
Use this index if you want to examine a specific system, interface or model.

Functional Index
For users thinking in terms of the function to be performed rather than the subject matter area. This index contains functions from the European ITS framework architecture.