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@@ -4,6 +4,7 @@ PGIP is a protocol for interactive proof to be used in the next
version of Proof General. It is based around the present protocol,
but implemented with a standard collection of messages rather than
different messages for different proof assistants. An outline of PGIP
+and an experimental DTD
is given in the <a href="/home/da/drafts/#white">white paper</a>. A
first implementation of PGIP will consist of (1) a filter (or
modification of the output routines) for an existing proof assistant,