Align prop and misc identifier requirements for the official FedRAMP namespace

[aj-stein-gsa]

This is a ...

improvement - something could be better

This relates to ...

• the FedRAMP OSCAL Registry
• the FedRAMP OSCAL baselines
• the Guide to OSCAL-based FedRAMP Content
• the Guide to OSCAL-based FedRAMP System Security Plans (SSP)
• the Guide to OSCAL-based FedRAMP Security Assessment Plans (SAP)
• the Guide to OSCAL-based FedRAMP Security Assessment Results (SAR)
• the Guide to OSCAL-based FedRAMP Plan of Action and Milestones (POA&M)
• the FedRAMP SSP OSCAL Template (JSON or XML Format)
• the FedRAMP SAP OSCAL Template (JSON or XML Format)
• the FedRAMP SAR OSCAL Template (JSON or XML Format)
• the FedRAMP POA&M OSCAL Template (JSON or XML Format)
• the FedRAMP OSCAL Validations

User Story

As a developer of OSCAL-based tools for FedRAMP documentation, I would like alignment on the properties @ns, @system and other identifier URIs that FedRAMP uses in different variations in their customization of the upstream custom models.

Goals

• Document a uniform approach in a decision record
• Review and update constraints accordingly
• Update website documentation accordingly

Dependencies

N/A

Acceptance Criteria

• All FedRAMP Documents Related to OSCAL Adoption (https://github.com/GSA/fedramp-automation) affected by the changes in this issue have been updated.
• A Pull Request (PR) is submitted that fully addresses the goals of this User Story. This issue is referenced in the PR.

Other information

No response

[aj-stein-gsa]

@Rene2mt volunteer to start this off for now and work on the ADR to start.