# Logical Models - HL7 Europe Base and Core FHIR IG v2.0.0

* [**Table of Contents**](toc.md)
* **Logical Models**

## Logical Models

### EHDS Logical Data Models

Logical data models (or information models) for the **European Health Data Space (EHDS)** are **currently under development** by the [**Xt-EHR Joint Action**](https://www.xt-ehr.eu/). These models will form the **basis of the Joint Action’s proposal** for the future EHDS Implementing Act.

They represent **evolving, refined interpretations** of the data sets described in the [**eHealth Network (eHN) Guidelines**](https://health.ec.europa.eu/ehealth-digital-health-and-care/digital-health-and-care/eu-cooperation/ehealth-network_en#ehealth-network-guidelines), and are expected to be updated further during the Joint Action process.

This Implementation Guide (IG) aims to **align with the emerging EHDS logical models** and to **provide HL7 FHIR profiles** that ***realise the requirements identified in these models**

The EHDS logical models currently supported in this version of the guide are listed below. For the most recent and in-progress versions, please refer to the [**Xt-EHR EHDS Logical Information Models**](https://build.fhir.org/ig/Xt-EHR/xt-ehr-common) Implementation Guide.

**Ongoing alignment:**The models are expected to continue evolving, with updates incorporated into this Implementation Guide to maintain alignment with the EHDS Implementing Acts.

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### Xt-EHR Logical Models

#### 🧩 Foundational Models

| | |
| :--- | :--- |
| [EHDSAddress](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSAddress.html) | EHDS refined base model for Address structure |
| [EHDSHumanName](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSHumanName.html) | EHDS refined base model for Human Name |
| [EHDSTelecom](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSTelecom.html) | EHDS refined base model for telecommunications and contact details |

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#### 🧑‍⚕️ Entity Models

| | |
| :--- | :--- |
| [EHDSPatient](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSPatient.html) | EHDS refined base model for Patient (subject of care) |
| [EHDSHealthProfessional](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSHealthProfessional.html) | EHDS refined base model for Health Professional |
| [EHDSOrganisation](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSOrganisation.html) | EHDS refined base model for healthcare organisations and providers |
| [EHDSLocation](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSLocation.html) | EHDS refined base model for location, site, or service delivery place |
| [EHDSBodyStructure](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSBodyStructure.html) | EHDS refined base model for Body structure |

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#### 🩺 Clinical Information Models

| | |
| :--- | :--- |
| [EHDSAlert](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSAlert.html) | EHDS refined base model for clinical alerts |
| [EHDSAllergyIntolerance](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSAllergyIntolerance.html) | EHDS refined base model for allergy or intolerance information |
| [EHDSCondition](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSCondition.html) | EHDS refined base model for a clinical condition, problem, diagnosis, or other event, situation, issue, or clinical concept that has risen to a level of concern |
| [EHDSObservation](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSObservation.html) | EHDS refined base model for medical test results and other clinical observations |
| [EHDSProcedure](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSProcedure.html) | EHDS refined base model for an action that is or was performed on or for a patient |
| [EHDSImmunisation](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSImmunisation.html) | EHDS refined base model for immunisation |

#### 📄 Document Models

| | |
| :--- | :--- |
| [EHDSDocument](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSDocument.html) | EHDS refined base model for clinical documents, including header, authorship, attestation, and legal metadata |

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#### 💊 Medication Models

| | |
| :--- | :--- |
| [EHDSMedication](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSMedication.html) | Logical model for prescribed/dispensed medication. Shared by statements, requests, dispensations, and treatment lines. Supports both generic (virtual) and branded (real) products. |
| [EHDSMedicationUse](https://www.xt-ehr.eu/fhir/models/1.0.0/StructureDefinition-EHDSMedicationUse.html) | Statement about a single medication as part of a medication summary |

