# Data Models

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**Note:** This page is currently being updated to align with the DSSC Blueprint 3.0 as well as the iSHARE Framework 3.0. An updated version will be published soon.
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According to the DSSC, data models make sure participants in a data space interpret data the same way. Without them, two systems might exchange information but come to different conclusions. This would undermine trust and create errors. 

* A data model works like a shared dictionary: it explains what each element means and how it relates to others.
* Agreeing on a reusable model enables semantic interoperability, so providers and consumers “speak the same language.”
* Different organisations have different needs, so data spaces must balance uniformity (to keep things clear and consistent) with flexibility (to fit diverse contexts).

<figure><img src="https://3616791469-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FjHLUr2NWnUxvFTGYU4AT%2Fuploads%2FUYlrwmxVlKOHANwEF7bh%2FScreenshot%202025-11-03%20135536.png?alt=media&#x26;token=7e465cd1-632b-4f35-8f31-1653bda968e6" alt=""><figcaption><p>Figure 12.Conceptual Model of the Data Models Building Block.</p></figcaption></figure>

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This topic is further explained in [The DSSC Description](https://dssc.eu/space/BVE2/1071255252/Data+Models).
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The iSHARE Trust Framework does not prescribe specific models. Instead, data spaces are encouraged to:

* Reuse established standards where possible (sectoral or cross-domain).
* Define lightweight governance rules for creating, updating, and adopting models.
* Focus on lowering barriers so new participants can onboard easily.
* Follow standard data sharing guidelines (like OpenID, etc.) while catering to industry-specific requirements.

Well-managed data models help reduce costs, improve interoperability, and make it easier to link datasets across domains.&#x20;

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Data Model connects closely with other building blocks:

* **Data Exchange:** Defines how data is structured and transferred.
* **Data Exchange & Data Sovereignty and Trust Pillar:** Uses protocols to ensure secure and reliable data transfer.
* **Data, Services and Offerings Description:** Describes data and services using standard models like DCAT.
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The guiding questions can help in the co-creation process and in defining this building block, so please see the next section.&#x20;
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