I finally caught up on this thread.

On 5 Dec 2013 09:59, "Mark Miller" <erig...@gmail.com> wrote:
>
> Good, I think we're converging on what the important sub-problem is:
building an abstraction mechanism that enables the open-ended expression of
projections, but not the expression of non-projections. My previous
statements about join were premised on such a projection-only abstraction.
But I mistakenly thought that we could build it by adapting the E and Joe-E
auditor logic. Sam is right that we can't. Some of Cormac's work on
trace-monitoring temporal contracts might be the answer, or at least a
place to start.
>
> Once we have such an open-ended projection-only abstraction, then all
these questions about equality become interesting and pressing.

I agree with Mark, the question is both interesting and pressing. Any
suggestions as to an appropriate 'projection-only abstraction'? -- P

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