While the model uses CIDOC CRM as ontology, it can be used without prior knowledge of data models, ontologies, etc. The software automatically maps information to the model. As the definitions of the CIDOC Conceptual Reference Model was imported into the system, its classes and properties can be browsed directly in OpenAtlas (see also here). Furthermore, it is possible to verify link-conformity between entities via the link-checker (for more information click here here).
During the development much emphasis was put on the fact that users do not have to concern themselves with the model or its ontology. Nevertheless, it is possible to display the CIDOC classes used in the user interface and thus gain insight into how the data is mapped.
Pressing the Model button on the start page leads to a graphical presentation of the model (see below), a link checking tool and links to the classes and properties.
Furthermore, it is possible to active Show CIDOC classes in the user interface. This will displays the CIDOC class of an entity in the detail view of a data base entry. To do so click the gear symbol and choose profile. Go to Display, press the Edit button and choose Show CIDOC classes.
While we try to only use CIDOC CRM classes and properties where possible (instead of introducing own classes or using extensions), some shortcuts are used to increase performance and to keep the code base maintainable. For more information, see OpenAtlas shortcuts.
While OpenAtlas uses the CIDOC CRM within the application, a finer grained model is needed to deal with any contextual differences needed for the user interface. Therefore, e.g. E33 - Lingustic Object can be a source or a source translation with different forms in different context. An overview of internal mapping and CIDOC CRM classes can be found here here