From d6a021df262590c8ec79834e3019ae34eb7c3e7e Mon Sep 17 00:00:00 2001
From: David Aspinall
Date: Thu, 9 Mar 2000 11:08:10 +0000
Subject: Added project for HOL PG

---
 html/projects.phtml    |  1 +
 html/projects/hol.html | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 html/projects/hol.html

(limited to 'html')

diff --git a/html/projects.phtml b/html/projects.phtml
index e46ca495..debd1385 100644
--- a/html/projects.phtml
+++ b/html/projects.phtml
@@ -30,6 +30,7 @@ title.
 <li><?php pgproject("pgip","A New Protocol for Interactive Proof in Proof General") ?></li>
 <li><?php pgproject("webreplay","A Web-based Proof Replayer for Proof General") ?></li>
 <li><?php pgproject("test","A Test Harness and Test Suite for Proof General") ?></li>
+<li><?php pgproject("hol","An instance of Proof General for HOL") ?></li>
 </ol>
 
 <h2>B. Projects not directly involving Proof General</h2>
diff --git a/html/projects/hol.html b/html/projects/hol.html
new file mode 100644
index 00000000..80e9e208
--- /dev/null
+++ b/html/projects/hol.html
@@ -0,0 +1,34 @@
+<h2>Proof General for HOL</h2> 
+<p> 
+It is fairly easy to get basic support for Proof General for 
+<a href="http://www.cl.cam.ac.uk/Research/HVG/HOL/HOL.html">HOL</a>, and
+this has recently been tried for HOL 98.  However, it would be a bigger
+and more interesting project to get proper and complete support for
+HOL working.  There are a couple of problems unique to HOL.
+</p>
+<p>
+Much more than Isabelle, HOL relies on its meta language, ML.  HOL
+proof scripts often use batch-oriented single step tactic proofs
+constructed in ML, but Proof General does not offer an easy way to
+edit these kind of proofs (as opposed to multi-step interactive
+proofs).  The "Boomburg" Emacs interface by Koichi Takahashi and
+Masima Hagiya addressed this problem, as well as providing support for
+proof-by-pointing to HOL.  Their interface (which is no longer
+maintained) could perhaps be embedded or reimplemented inside Proof
+General.  Implemented in a generic way, batch script editing would
+also be useful for Isabelle.
+</p>
+<p>
+Another problem is that HOL scripts sometimes use SML structures,
+which can cause confusion because Proof General does not really parse
+SML, it just looks for semicolons.  Again, this could be improved by
+taking a better parser (e.g. from sml mode).
+</p>
+<p>
+<b>Skills:</b>
+Some Standard ML, some Emacs Lisp.  Basic understanding of
+proof assistant behaviour.
+</p><p>
+<b>Proposer:</b>
+<a href="http://zermelo.dcs.ed.ac.uk/~da">David Aspinall</a>.
+</p>
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