LIDO FAQ – Practical questions

Go to “LIDO overview”

Why are there duplex categories: display elements and indexing elements?

The indexing element holds information prepared best for database retrieval, the display element presents it in a form that is pleasant to read. An artist’s name could be included for instance in the index element as ‘Tischbein, Johann Friedrich August’ while the display element offers it as ‘Johann Friedrich August Tischbein (1750-1812)’. Note that the additional biographical information in the display element comes from an artists authority file or an additional data category.

Are there mandatory elements? Which?

Yes, there are a few mandatory elements:

  • object/work type: e.g. painting, tableware, motor vehicle
  • title/object name: e.g. Mona Lisa or cup or Volkswagen beetle
  • record ID: (automatically assigned number of the data record, not inventory number!): e.g. 97001270
  • record type: e.g. item or collection or series
  • record source

Make sure that each record to published contains these elements – or they will to be added.

What is the difference between type of object and classification?

The element ObjectWorkType holds the term(s) which most precisely identify the object (normally its name), while the classification provides the integration of the object into a broader context.

These elements cannot be distinguished in some mappings. If you are not sure what should be done in your special mapping project, we recommend to use the mandatory object/work type category only.

Which elements contain information about people, places, and events?

LIDO is a CRM (Conceptual Reference Model)-based format. Information about actors, dates, and places related to an object are combined into event sets, as all their relations to the object are established by events like like production, use, discovery etc.

Event sets contain essential search criteria, so we strongly recommend to generate them. Sometimes the actors, dates and place information belonging to one event cannot be extracted in a consistent way from the data. Generate several Event Sets in this case, using the same eventType where applicable.

Do you have any further questions?

For questions or feedback about LIDO please send an email to
You may also subscribe to the LIDO listserv at

Go to “LIDO FAQ – General questions”