This is the object's relative name (Rn) — just the last path segment of its Dn, the piece this NetworkFeatureCont instance contributes to its own address within the MIT tree. It groups the domain's fabric-capability records together under one parent so they can be listed as a set. For this kind of object the Rn is typically built from the same identifying value as its Dn's final segment, e.g. the tail end of `sys/switch-A/network-feature-cont`, so two sibling instances never end up with colliding addresses under the same parent.