In general the control spec is pretty good about saying what event attributes indicate. One exception are stream purposes which are completely undocumented. https://gitweb.torproject.org/torspec.git/blob/HEAD:/control-spec.txt#l1411 ``` atagar@morrigan:~/Desktop/tor/torspec$ grep -R "UPLOAD_DESC" ./* ./control-spec.txt: Purpose = "DIR_FETCH" / "UPLOAD_DESC" / "DNS_REQUEST" / atagar@morrigan:~/Desktop/tor/torspec$ grep -R "DNS_REQUEST" ./* ./control-spec.txt: Purpose = "DIR_FETCH" / "UPLOAD_DESC" / "DNS_REQUEST" / ... etc... ``` See the StreamStatus above for an example of a nice mapping between attributes and a description.