Inverse of pdppScopeKey.
A scope string. Wildcards (pdpp.chatgpt.*) and grant entries with an operation prefix (write:pdpp.chatgpt.messages) are not keys.
pdpp.chatgpt.*
write:pdpp.chatgpt.messages
The source_id and stream, or null when key is not a PDPP key.
source_id
null
key
Inverse of pdppScopeKey.