Silver criterion maintenance_or_update (MUST; group Change Control, Previous versions). Criterion text: The project MUST maintain the most often used older versions of the product or provide an upgrade path to newer versions. If the upgrade path is difficult, the project MUST document how to perform the upgrade (e.g., the interfaces that have changed and detailed suggested steps to help upgrade).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.