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Open data

OIMAP datasets in CSV and JSON, under an open licence, updated every quarter.

Updated : October 28, 2026· 3 min read

Data to reuse

Portrait of Machtelt Suijs, Maerten van Heemskerck (c. 1540–45)
Portrait of Machtelt Suijs, Maerten van Heemskerck (c. 1540–45)

The Organization publishes part of its data as open datasets. They can be downloaded in CSV and JSON, together with a dictionary of variables and a methodological note.

This openness responds to the requirement of transparency set out in the Organization's values. The datasets are updated every quarter, on an indicative basis.

  • Open-access data
  • CSV
  • Licence

Open data at a glance

2Formats: CSV and JSON
4Updates per year (indicative)
1Open licence (indicative)
2010Start of the market series

Source: OIMAP General Secretariat.

Breakdown

MarketAnnual series
Aggregated BIOPTotals
CertificationsBy type
TrainingBy region

Indicative breakdown of the catalogue of open datasets.

What the catalogue contains

The catalogue includes economic series on the market, aggregated BIOP totals, certification figures by type of document and training data by region. Each dataset has a stable identifier.

Personal data and sensitive information are excluded from the outset.

Farmhouse on the Slope of a Hill, Fra Bartolommeo (c. 1508)
Farmhouse on the Slope of a Hill, Fra Bartolommeo (c. 1508)
Virgin and Child Enthroned with Saints Francis and Giovanni Gualberto, Benedetto Buglioni (c. 1510–20)
Virgin and Child Enthroned with Saints Francis and Giovanni Gualberto, Benedetto Buglioni (c. 1510–20)
Saint Jerome and the Lion (From the former Church of St. Peter in Erfurt), Tilman Riemenschneider (c. 1495)
Saint Jerome and the Lion (From the former Church of St. Peter in Erfurt), Tilman Riemenschneider (c. 1495)

Formats and structure

CSV files are encoded in UTF-8, with a header row and a semicolon separator. JSON files follow the same structure as arrays of objects.

The data dictionary specifies, for each column, the name, type, unit and definition. It is the best entry point.

Reuse licence

The datasets are placed under an open licence: reuse, including commercial reuse, is permitted provided the source and the update date are mentioned.

The Organization does not guarantee the suitability of the data for any particular use, and recommends re-reading the methodological note.

Update frequency

The datasets are refreshed every quarter, on an indicative basis. The official annual figures remain the reference; quarterly values are provisional and may be revised.

A change log accompanies each publication in order to trace the revisions.

Available datasets

Indicative catalogue
DatasetContentFormat
marche-annuelValue, segments, regionsCSV, JSON
biop-totauxTotals and restitutionsCSV, JSON
certificationsDocuments by typeCSV, JSON
formation-regionsOfficials trained by regionCSV

Milestones

  1. First series

    Market data.

  2. Opening

    First datasets published (indicative).

  3. Complete series

    Reference financial year.

  4. Updated

    Quarterly schedule (indicative).

Citing the source

View of the Gulf of Pozzuoli from Solfatara, Philipp Hackert (1803)
View of the Gulf of Pozzuoli from Solfatara, Philipp Hackert (1803)
Bidri Hookah Bowl with Roses (c. 1650s)
Bidri Hookah Bowl with Roses (c. 1650s)
Study for "A Sunday on La Grande Jatte", Georges Seurat (1884)
Study for "A Sunday on La Grande Jatte", Georges Seurat (1884)

CSV or JSON

Lace Towel End (c. 1700s–1800s)

CSV

Spreadsheet
  • Easy reading
  • Compatible with spreadsheets
  • Lightweight files

For manual analysis.

Bull Head Attachment (c. 700–600 BCE)

JSON

Applications
  • Explicit structure
  • Integration via API
  • Types respected

For development.

Using a dataset

  1. Choose the dataset

    In the catalogue.

  2. Download

    CSV or JSON.

  3. Read the dictionary

    Definitions of the columns.

  4. Cite

    Source and date.

Before publishing an analysis

A developer

Panel (c. 1780–1840)
« The data dictionary saved us weeks of interpretation. The files load directly into our tool. »
Samuel Okonkwo, developer (example)

Glossary

Dataset
Structured set of values published together.
Dictionary
Description of a dataset's columns.
Open licence
Permission to reuse under conditions.
Version
Dated state of a dataset.

Report an error

If you detect an anomaly, write to the General Secretariat via the contact form, stating the name of the dataset, the version and the line concerned.

Corrections are published in the next update and mentioned in the change log.

Frequently asked questions

Is it free?

Yes, the download is free.

May I use it commercially?

Yes, citing the source (indicative licence).

How often?

Every quarter (indicative).

Is there a programming interface?

The files can be downloaded; a dedicated interface is under study.

Useful documents

Contacts

A Palace with an Arched Bridge (A Roman Villa), Hubert Robert (1760)
A Palace with an Arched Bridge (A Roman Villa), Hubert Robert (1760)
General SecretariatParis — Headquarters+33 1 00 00 00 00secretariat@oimap.exampleMonday to Friday, 9 am – 5 pm

Report an anomaly

Temple of Athene Nike. Venus Victrix—Wingless Victory, Dimitrios Constantin (c. 1850s–60s)

Write to the General Secretariat.

Write
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