A registry run under the series registers items so that three things hold: each registered object carries an identifier unique within the registry; the source of the metadata and of the object it describes is recorded; and the quality of the metadata is watched so that it keeps serving its purpose.
This control maps to 1 controls across 1 other frameworks. If you already hold one of them, the evidence you collected for it is the starting point here rather than new work.
Every mapping shown was judged rather than inferred from wording similarity, and the ones that failed review are published too. See the coverage reports and what was rejected.
The graph holds this control, the 1 it maps to, and the evidence behind each claim, over MCP and REST.