XSpec Clarity - For Scenario FedRAMP OSCAL SSP Attachments - ssp.xspec

Extended Description

As a user, I would like to read clear XSpec textual representations in the web documentation.

See #516 for more general description.

Note: This issue was not completed due to lack of time nearing end of project.

Acceptance Criteria

[x] All Schematron assertion messages are declarative statements which affirm the positive test outcome.
[x] All Schematron assertion diagnostic messages are declarative statements which explain the negative test outcome.
[x] The Schematron code has no assertion failures when validated using src/validations/styleguides/sch.sch using the basic phase.
[x] XSpec unit tests for positive and negative Schematron assertion outcomes accompany all Schematron assertions (where feasible).
[x] XSpec descriptions read clearly in the web documentation for the scenario OSCAL FedRAMP SSP

Definition of Done

[x] Acceptance criteria met
[x] Unit test coverage of our code > 95%
[ ] Automated code quality checks passed
[x] Security reviewed and reported
[x] Reviewed against plain language guidelines
[x] Code must be self-documenting
[x] No local tech debt
[x] Load/performance tests passed – needs to be created/automated
[x] Documentation updated
[x] Architectural Decision Record completed as necessary for significant design choices
[ ] PR reviewed & approved
[ ] Source code merged

18F / fedramp-automation