-# APT External Dependency Solver Protocol (EDSP) - version 0.4
+# APT External Dependency Solver Protocol (EDSP) - version 0.5
This document describes the communication protocol between APT and
external dependency solvers. The protocol is called APT EDSP, for "APT
The value of the **Request:** field is a string describing the EDSP
protocol which will be used to communicate. At present, the string must
-be `EDSP 0.4`.
-
-a unique request identifier, such as an
-UUID. Request fields are mainly used to identify the beginning of a
-request stanza; their actual values are otherwise not used by the EDSP
-protocol.
+be `EDSP 0.5`. Request fields are mainly used to identify the beginning
+of a request stanza; their actual values are otherwise not used by the
+EDSP protocol.
The following **action fields** are supported in request stanzas: