The terminology service page references the use of "@all" - reference to an implicit value set of all value sets on a server. 

A ticket was entered (FHIR-19442) asking for clarification and assigned to Vocab. 

See discussion for FHIR-19442 here: https://confluence.hl7.org/display/VOC/FHIR+Tracker+Issues+2021-09-01Call+Agenda+and+Minutes 

Vocab considered the issue, and because the content is owned by FHIR-I, decided to suggest the option where the information is not removed but the text changed slightly to hopefully make it more clear.  The ticket was transferred to FHIR-I

Attendees at the Vocab tracker call felt that this is not useful for the general community, and that a server with specific/special requirements could implement this. It does not pass the 80/20 test. 

Another ticket will be entered to transfer ownership of the terminology service page to Vocab.