If a live property or method is optional for a kind of versioning resource, the feature that introduces that live property or method is noted in parentheses following the live property or method name.??A.1 DeltaV-Compliant Unmapped URL (a URL that identifies no resource)Supported methods: ??PUT [RFC2616]MKCOL [RFC2518]MKACTIVITY (activity)VERSION-CONTROL (workspace)MKWORKSPACE (workspace)A.2 Delta