# Change Log - Recognized Coordinating Entity (RCE) Implementation Guide v1.9.0

* [**Table of Contents**](toc.md)
* **Change Log**

## Change Log

### Change Management Overview

Sequoia maintains change control for all assets related to this project, including to this document, the software described by this document, and the associated operational environments (people, processes, and systems). The following sections document the information needed by implementers in terms of change management. Certain information, such as actual environmental access base URLs is confidential and not documented here.

### Implementation Guide Changes

* Date: 12/22/2025
  * Version: 1.9.0
  * Author: Rick Geimer
  * Summary: * Updated to version 1.9.0 of the Sequoia base IG
* Added additional FHIRIGConformance, Roles, and Downtime extension examples
* Fixed minor typos in examples

* Date: 09/30/2025
  * Version: 1.8.1
  * Author: Diana Wright
  * Summary: * Added 3 operationDefinition instances to provide guidance on custom operations in the Directory: Activate Hierarchy, Deactivate Hierarchy, Update TEFCAID for Entry and Children
* Updated example instances to include transaction types, endpoints with type and Data Absent Reason (DAR) URLs where appropriate.
* Updated IG version to 1.8.1 

* Date: 08/20/2025
  * Version: 1.8.0
  * Author: Diana Wright
  * Summary: Updated to version 1.8.0 of the Sequoia base IG
* Date: 08/06/2025
  * Version: 1.7.0
  * Author: Diana Wright
  * Summary: Updated IG version: 1.7.0 of the Sequoia base IG
* Date: 07/02/2025
  * Version: 1.6.2
  * Author: Diana Wright
  * Summary: Changed cardinality of RCE Organization.identifier:TEFCAID to 1..1
* Date: 06/11/2025
  * Version: 1.6.1
  * Author: Diana Wright
  * Summary: * Added 11 example instances to illustrate scenarios described in SOP section 4.2
* Updated binding on RCE Organization.address:united-states-address.state from extensible to required.
* Updated IG version: 1.6.1 

* Date: 06/10/2025
  * Version: 1.6.0
  * Author: Diana Wright
  * Summary: Updated IG version: 1.6.0 of the Sequoia base IG
* Date: 05/13/2025
  * Version: 1.5.1
  * Author: Rick Geimer
  * Summary: Reverted TEFCA ID to optional (0..1) in RCEOrganization
* Date: 05/13/2025
  * Version: 1.5.0
  * Author: Diana Wright
  * Summary: Updated to version 1.5.0 of the Sequoia base IG
* Date: 02/26/2025
  * Version: 1.4.1
  * Author: Diana Wright
  * Summary: * Changed cardinality for Child Organization.endpoint from 0..* to 0..0
* Updated profile description of Child to state that a Child cannot be an endpoint (node).
* Updated Specification page, section 2.2.1 Profiles, description of Child to state that a Child cannot be an endpoint (node).
* Added TEFCA ID as required (1..1) in RCEOrganization
* Added TEFCA ID to 4 RCEOrganization example files

* Date: 02/26/2025
  * Version: 1.4.0
  * Author: Diana Wright
  * Summary: Updated to version 1.4.0 of the Sequoia base IG
* Date: 01/28/2025
  * Version: 1.3.0
  * Author: Diana Wright
  * Summary: Updated to version 1.3.0 of the Sequoia base IG
* Date: 12/23/2024
  * Version: 1.2.0
  * Author: Rick Geimer
  * Summary: Updated to version 1.2.0 of the Sequoia base IG
* Date: 11/27/2024
  * Version: 1.1.0
  * Author: Diana Wright
  * Summary: Updated to version 1.1.0 of the Sequoia base IG
* Date: 08/30/2024
  * Version: 1.0.10
  * Author: Rick Geimer
  * Summary: Updated to version 1.0.10 of the Sequoia base IG
* Date: 07/22/2024
  * Version: 1.0.9
  * Author: Rick Geimer
  * Summary: * Updated to version 1.0.9 of the Sequoia base IG
* Fixed case issue with slice names

* Date: 05/20/2024
  * Version: 1.0.8
  * Author: Rick Geimer
  * Summary: Updated to version 1.0.8 of the Sequoia base IG
* Date: 04/25/2024
  * Version: 1.0.7
  * Author: Rick Geimer
  * Summary: Updated to version 1.0.7 of the Sequoia base IG
* Date: 04/08/2024
  * Version: 1.0.6
  * Author: Rick Geimer
  * Summary: Updated to version 1.0.6 of the Sequoia base IG
* Date: 03/21/2024
  * Version: 1.0.5
  * Author: Rick Geimer
  * Summary: Updated to version 1.0.5 of the Sequoia base IG
* Date: 02/07/2024
  * Version: 1.0.4
  * Author: Rick Geimer
  * Summary: Updated to version 1.0.4 of the Sequoia base IG
* Date: 12/13/2023
  * Version: 1.0.3
  * Author: Rick Geimer
  * Summary: Changed the binding on the PurposesOfUse extension to a required binding to the RCE-Purpose-VS value set
* Date: 11/03/2023
  * Version: 1.0.2
  * Author: Rick Geimer
  * Summary: Changed cardinality for Sequoia Endpoint – Endpoint.extension.Transaction from 0..1 to 1..1
* Date: 07/21/2023
  * Version: 1.0.1
  * Author: Rick Geimer
  * Summary: * Changed cardinality for Sequoia Organization – Organization.identifier:AAID from 0..1 to 0..*
* Changed cardinality for Sequoia Endpoint – Endpoint.identifier:AAID from 0..1 to 0..*

* Date: 06/30/2023
  * Version: 1.0.0
  * Author: Rick Geimer
  * Summary: Initial Release

