# Data model

The OpenAIRE Graph comprises several types of [entities](../category/entities) and [relationships](/category/relationships) among them.

The latest version of the JSON schema can be found on the [Downloads](../downloads/full-graph) section.

<p align="center">
    <img loading="lazy" alt="Data model" src={require('../assets/img/data-model-3.png').default} width="80%" className="img_node_modules-@docusaurus-theme-classic-lib-theme-MDXComponents-Img-styles-module"/>
</p>

The figure above, presents the graph's data model. 
Its main entities are described in brief below:

* [Research products](./entities/research-product) represent the outcomes (or products) of research activities.
* [Data sources](./entities/data-source) are the sources from which the metadata of graph objects are collected. 
* [Organizations](./entities/organization) correspond to companies or research institutions involved in projects,
responsible for operating data sources or consisting the affiliations of Product creators.
* [Projects](./entities/project) are research project grants funded by a Funding Stream of a Funder.
* [Communities](./entities/community) are groups of people with a common research intent (e.g. research infrastructures, university alliances).
* Persons correspond to individual researchers who are involved in the design, creation or maintenance of research products. Currently, this is a non-materialized entity type in the Graph, which means that the respective metadata (and relationships) are encapsulated in the author field of the respective research products.

:::note Further reading

A detailed report on the OpenAIRE Graph Data Model can be found on [Zenodo](https://zenodo.org/record/2643199).
:::