> For the complete documentation index, see [llms.txt](https://guides.ohie.org/arch-spec/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guides.ohie.org/arch-spec/main-1/change-log-and-versioning.md).

# Change Log and Versioning

## Version 4.0 (September 2021 - This content)

The following are an overview of the significant content changes that have been made.  

### Additions

* Added [Point-of-Care Systems](/arch-spec/main-1/openhie-component-specifications-1/point-of-care-systems.md) page
* Added [How to use the Specification](/arch-spec/main-1/get-started.md) page
* Added [Standards and Profiles](/arch-spec/main-1/architecture-specification/standards-and-profiles.md) page
* Added a new workflow section, [Vaccine Workflows](/arch-spec/main-1/introduction/vaccine-workflows.md).  
* Moved [Architecture Principles](/arch-spec/main-1/architecture-specification/architectural-principles.md) from the wiki to the Specification 
* Moved [Architecture Standards and Profiles](/arch-spec/main-1/architecture-specification/standards-and-profiles.md) from the wiki to the Specification

### Updates 

* Updated diagram on the [Architecture](/arch-spec/main-1/architecture-specification/overview-of-the-architecture.md) page to specifically denote Community Health Information Systems (CHIS). 
* Changed the format from PDF to GitBook 
* Minor changes in wording and formatting for GitBook
* On Feb 15th it was noted that a section of this workflow was missing.  [Query Patient Demographic Records by Demographics Workflow](/arch-spec/main-1/introduction/patient-identity-management-workflows/create-patient-demographic-record-workflow.md)was updated.  

### How to Reference This Version

This is the 4.0 (September 2021) version of the specification.  To reference it, include the link (<https://guides.ohie.org/arch-spec/>) and state the version number. &#x20;

## Version 3.0 (September 2020)

Previous releases of the OpenHIE Architecture Specification are stored on the [OpenHIE website](https://ohie.org/framework/).

### Additions

* **OpenHIE Workflow (Data Exchange) Maturity Level** This maturity level takes into account the maturity of underlying IHE / FHIR specifications and the use of the workflow pattern in implementations.
* **Laboratory Workflows** Data exchanges revolving around laboratory information have been added to the specification.
* **The Facility Registry Requirements** The requirements for the key features of a facility registry were updated.
* **Terminology Workflow Updates** The terminology workflows were updated to include IHE specification.

## Previous Versions

**Previous Specification Versions** Previous releases of the specification document can be found on this page of the [OpenHIE Wiki](https://wiki.ohie.org/).

<img src="/files/-MeV49nW2Vt1FuhItX8V" alt="" data-size="line"> **This work is licensed under a Creative Commons Attribution 4.0 International License.**