[ontoiop-forum] DOL finalisation

[Fabian Neuhaus]

Dear Pat, dear Till, 

(a) I submitted a ticket at OMG. 
http://issues.omg.org/browse/DOL11-2
Note that I have been intentionally vague, since I don’t think anybody has shown yet whether CL is equally expressive as first-order with induction. 

(b) Pat, to give some context to this diagram: One major benefit of DOL’s language translation is that it enables  tool support, in particular reasoner support, for languages that have no native support. Thus, as Till pointed out, the translation to second-order logic is more interesting than the translation to infinitary logics. Hets — which implements DOL — actually distinguishes between different sublanguages of CLIF, in particular between CLIF with and without sequence markers. Dependent on what sublanguage is detected by Hets a different translation is utilized. 

Best
Fabian 


> Am 20.12.2017 um 23:32 schrieb Pat Hayes <phayes at ihmc.us>:
> 
> I hadn’t seen that diagram before. I believe that it is inaccurate to describe CL as having ‘some second-order constructs’. Sequence markers take CL outside FO expressivity, but not to second-order. CL with sequence markers is in fact a subset of the infinitary logic Lw1-w which allows countably infinite conjunctions. This is a long way short of full second-order logic. If one restricts CL (Lw1-w) so that sequence markers (infinite conjunctions) occur only on the LHS of sequents, it is first order. So sequence makers can be used in ontologies (ie as ‘axioms’) without going beyond FO expressivity. 
> 
> Pat
> 
>> On Dec 20, 2017, at 7:01 AM, John F Sowa <sowa at bestweb.net> wrote:
>> 
>> Congratulations to everyone working on the DOL project.
>> 
>> From Fabian via ontoiop-forum,
>>> Good news concerning the standardisation of DOL! During the last
>>> OMG Technical Meeting the Architecture Board approved the changes
>>> that we made to DOL during the “Finalisation Phase” (which in our
>>> case lasted 2 years). Hence, we cleared the last major hurdle on
>>> our way to the release of DOL 1.0. I expect that this will happen
>>> in February 2018.
>> 
>> And Fabian, I'm sending a copy of this note to Ontolog Forum, and
>> I also attached a copy of an earlier diagram (dol.jpg).
>> 
>> Does this diagram reflect the current version?  If so (or not),
>> could you please send the URL of the latest documentation to
>> Ontolog Forum?
>> 
>> And is software available for the various mappings in that diagram?
>> 
>> John
>> <dol.jpg>
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>