From christoph.lange at uni-bremen.de  Wed Feb  1 20:40:33 2012
From: christoph.lange at uni-bremen.de (Christoph LANGE)
Date: Wed, 01 Feb 2012 20:40:33 +0100
Subject: [Hets-users] Mapping symbols to terms
Message-ID: <4F299531.1020106@uni-bremen.de>

Dear all,

the following question occurred in the context of OntoIOp, but let me 
ask it here first, as far as it concerns HetCASL in its current state.

= The general problem =

In a symbol map, is it possible to map symbols (of the signature of the 
source ontology) to terms (in the target logic, using symbols of the 
target ontology)?

Or, if this is not possible, why not?

One might argue that, if I wanted to map

source.a |-> SomeLogicalConnective(target.b, target.c)

I could as well map source.a |-> target.foo, and then, within the 
target, define that

foo = SomeLogicalConnective(b, c)

But what if the target logic, such as some OWL profiles, or RDF, doesn't 
support equality?

= A concrete example =

A concrete example: In my "AAL" example, the HetCASL subset of which is 
available at 
https://svn-agbkb.informatik.uni-bremen.de/Hets-lib/trunk/Ontology/Examples/AAL.het, 
I would like to reuse a propositional logic ontology (which formalizes 
the state of a stupid light switch) in an OWL setting, and therefore I'd 
like to map its propositional variables to OWL concepts.

(Please ignore, for a moment, that there are unsolved _semantic_ issues 
with the PL?OWL translation.)

I thought that a syntax like the following might help:

logic OWL

ontology MyOntology =
   OpenAALOWLOntology
   then
   logic Propositional : {
     props light_on, person_in_room, dark_outside
     . light_on <=> person_in_room /\ dark_outside
   }
   with
     person_in_room |-> openaal:Room that inverse openaal:is-in-room 
openaal:AssistedPerson min 1,
     light_on |-> openaal:Room that
                    inverse openaal:is-in-room value
                      not (openaal:LightSwitch value 
openaal:has-power-state openaal:Off)

With that I would like to express:
* The propositional variable person_in_room is true (for one arbitrary 
but fixed room) iff the given OWL individual (not: "_some_ OWL 
individual", and not: "_all_ OWL individuals") is an instance of the 
class "Room that inverse is-in-room AssistedPerson min 1".
* The propositional variable light_on is true (for one arbitrary but 
fixed room) iff the given OWL individual is a room in which all light 
switches (if any) are on, i.e. there is no light switch that is not on.

In this concrete case I'm not restricted to an OWL profile without 
equality, i.e. I would be able to say (in OWL) that e.g.

Class: RoomWithAPersonInside
   EquivalentTo: openaal:Room that inverse openaal:is-in-room 
openaal:AssistedPerson min 1

but what if I were in a weaker profile?

= Further problems =

If we enabled symbol |-> term mappings, we might run into some issues 
with parsing.  The language of the terms is the target logic of the 
translation, which means that we'd have to parse expressions in that 
logic not only inside specs, but also in symbol |-> term mappings. 
Would that be possible without major problems?

Please let me know what you think.

Cheers, and thanks in advance,

Christoph

-- 
Christoph Lange, Universit?t Bremen
http://kwarc.info/clange, Skype duke4701

? Workshop Semantic Web Collaborative Spaces (SWCS) @ WWW 2012
   Lyon, 17 April 2012.  Deadline 6 February.  http://www.swcs2012.org
? SePublica Workshop @ ESWC 2012.  Crete, Greece, 27/28 May 2012.
   Deadline 29 Feb.  http://sepublica.mywikipaper.org
? I-SEMANTICS 2012.  Graz, Austria, 5-7 September 2012
   Abstract Deadline 2 April.  http://www.i-semantics.at

From christoph.lange at uni-bremen.de  Tue Feb  7 17:29:40 2012
From: christoph.lange at uni-bremen.de (Christoph LANGE)
Date: Tue, 07 Feb 2012 17:29:40 +0100
Subject: [Hets-users] Updated to latest COLORE svn
Message-ID: <4F315174.6080201@uni-bremen.de>

Hi all,

some news for those who are interested in Common Logic:

Now that COLORE (the Common Logic Repository) has made considerable 
progress, we are no longer hosting our own copy in 
https://svn-agbkb.informatik.uni-bremen.de/Hets-lib/trunk/CommonLogic, 
but we have an external pointing to the actual COLORE svn repository at 
https://colore.googlecode.com/svn/trunk/ontologies.

Please see http://colore.googlecode.com for further information about 
COLORE.

Cheers,

Christoph

-- 
Christoph Lange, Universit?t Bremen
http://kwarc.info/clange, Skype duke4701

? Workshop Semantic Web Collaborative Spaces (SWCS) @ WWW 2012
   Lyon, 17 April 2012.  Deadline 17 February.  http://www.swcs2012.org
? SePublica Workshop @ ESWC 2012.  Crete, Greece, 27/28 May 2012.
   Deadline 29 Feb.  http://sepublica.mywikipaper.org
? I-SEMANTICS 2012.  Graz, Austria, 5-7 September 2012
   Abstract Deadline 2 April.  http://www.i-semantics.at