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Re: Explain profile acronyms

From: Jie Bao <baojie@cs.rpi.edu>
Date: Tue, 4 Aug 2009 11:19:00 -0400
Message-ID: <b6b357670908040819jf986a21j1d1947ca4342fafa@mail.gmail.com>
To: Jim Hendler <hendler@cs.rpi.edu>
Cc: Ian Horrocks <ian.horrocks@comlab.ox.ac.uk>, Uli Sattler <sattler@cs.man.ac.uk>, Pascal Hitzler <hitzler@aifb.uni-karlsruhe.de>, Sandro Hawke <sandro@w3.org>, "Peter F. Patel-Schneider" <pfps@research.bell-labs.com>, public-owl-wg@w3.org
On Tue, Aug 4, 2009 at 9:20 AM, Jim Hendler<hendler@cs.rpi.edu> wrote:
>>>>>>> Note that each of the profiles is a (strict)  syntactic subset of OWL
>>>>>>> DL, but none of the profiles is a subset of  another
>
>
> While the above is technically correct,  I think that some people would miss
> the fact that "syntactic" subsets of OWL 2  DL is different than the fact
> that you must use the DL restrictions (esp for RL) - so I'd suggest one of
> the following three rewordings:
>
> Note that each of the profiles is a (strict) syntactic subset of OWL 2's
> syntax, but none of the profiles is a subset of each other  [[i.e. since
> syntactically OWL DL and OWL Full are same thing, why bring up the issue]]
>
> or
>
> Note that each of the profiles is a (strict) syntactic subset of OWL 2 DL
> and none of the profiles is a subset of another.  We note that OWL RL is
> expected to be used primarily with OWL Full semantics, the others with OWL
> DL. [[which is clear, but I suspect controversial]]
>
I think the last sentence is important. It would be confusing if we
just say RL is a syntactic subset of DL, but its reasoning rules are
in the RDF semantics. It might be bizarre to explain to some
RDF-minded that why in RL we can't say hasBrother (transitive) and
hasSister (transitive) are disjoint, or hasBrother is irreflexive, but
we may still apply RL inference rules to an OWL Full ontology that
says so.

Jie

> or
>
> just say
>
> None of these profiles is a subset of another [[and avoid the whole issue]]
>
> I'm sorry, but I do consider the quoted line above to a problem, and one I
> cannot ignore....
>  -Jim H.
>
>
>
>
> On Aug 4, 2009, at 6:42 AM, Ian Horrocks wrote:
>
>> This seems like a good compromise.
>>
>> I have made the relevant changes. The diff is:
>>
>>
>> http://www.w3.org/2007/OWL/wiki/index.php?title=Profiles&diff=25048&oldid=24645
>>
>> Regards,
>> Ian
>>
>>
>> On 4 Aug 2009, at 10:59, Uli Sattler wrote:
>>
>>>
>>> On 3 Aug 2009, at 21:51, Pascal Hitzler wrote:
>>>
>>>> I would really stick to the real/historic explanation (EL family).
>>>
>>> we could also add "which is called EL because it is a *l*anguage (or
>>> *l*logic) that only provides *e*xistential quantification of variables."?
>>> Cheers, Uli
>>>
>>>> I understand that it's not directly helpful, but at least it becomes
>>>> clear that there is some reason to it - and in case somebody wants to read
>>>> up on it on the DL literature, he's not lost in the DL acronyms ...
>>>>
>>>> In fact I'll add this to the primer as soon as the wiki is accessible
>>>> again (it currently seems to be down...)
>>>>
>>>> Pascal.
>>>>
>>>>
>>>> Sandro Hawke wrote:
>>>>>>
>>>>>> I certainly see no problem with adding some minor explanatory text
>>>>>> along these lines.
>>>>>
>>>>> It seems good to me, too, except for the EL explanation.  The reference
>>>>> to EL++ doesn't help anyone.  (If you know about EL++, you don't need
>>>>> the explanation; if you don't know about EL++, then knowing the
>>>>> association doesn't help.)
>>>>> So where does the "E" come from?  I guess it's from "Existential
>>>>> Restrictions"...  That doesn't help very much here.  Maybe we can
>>>>> propose a mnemonic?  "Extensive", "Efficient", "Easy", "Economical",
>>>>> "Enormous", "Elephantine"...  :-)
>>>>> Maybe something like:
>>>>>  - The EL profile was orginally named for its use of Existential
>>>>>   restrictions, but for a mnemonic, we note that it supports
>>>>>   Efficient reasoning, even with Enormous ontologies.
>>>>> ... or something like that.
>>>>>   -- Sandro
>>>>>>
>>>>>> From: Ian Horrocks <ian.horrocks@comlab.ox.ac.uk>
>>>>>> Subject: Re: Explain profile acronyms
>>>>>> Date: Mon, 3 Aug 2009 11:40:57 -0500
>>>>>>
>>>>>>> IMHO this is a not completely unreasonable request. I would propose
>>>>>>>  to respond by adding to the Introduction of Profiles:
>>>>>>>
>>>>>>> * brief explanations of the acronyms, namely:
>>>>>>>  - The EL acronym reflects the profile's basis in the EL family of
>>>>>>>  description logics [EL++].
>>>>>>>  - The QL acronym reflects the fact that query answering in this
>>>>>>>  profile can implemented by rewriting queries into a standard  relational
>>>>>>> Query Language.
>>>>>>>  - The RL acronym reflects the fact that reasoning in this profile
>>>>>>>  can be implemented using a standard Rule Language.
>>>>>>> * the statement "Note that each of the profiles is a (strict)
>>>>>>>  syntactic subset of OWL DL, but none of the profiles is a subset of
>>>>>>>  another."
>>>>>>>
>>>>>>> Comments and/or other suggestions?
>>>>>>>
>>>>>>> Ian
>>>>>>>
>>>>>>>
>>>>>>>> From: Gioele Barabucci <barabucc@cs.unibo.it>
>>>>>>>> Date: Mon, 20 Jul 2009 14:54:08 +0200
>>>>>>>> To: public-owl-comments@w3.org
>>>>>>>> Message-ID: <20090720125407.GA32507@cs.unibo.it>
>>>>>>>>
>>>>>>>> Hello,
>>>>>>>>
>>>>>>>> could you please document the meaning of the EL, QL and DL acronyms
>>>>>>>> in
>>>>>>>> the overview section of owl2-profiles and other OWL 2 documents?
>>>>>>>>
>>>>>>>> Also, could you explicitly state whether an OWL 2 profile is a
>>>>>>>> strict
>>>>>>>> subset of another?
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>>
>>>>>>>> --
>>>>>>>> Gioele Barabucci <barabucc@cs.unibo.it>
>>>>>>>
>>>>>>>
>>>>
>>>> --
>>>> PD Dr. Pascal Hitzler
>>>> pascal@pascal-hitzler.de   http://www.pascal-hitzler.de
>>>> Semantic Web Textbook: http://www.semantic-web-book.org
>>>>
>>>>
>>>
>>
>>
>
> We choose to go to the moon in this decade and do the other things, not
> because they are easy, but because they are hard - John F. Kennedy, Sept 12,
> 1962
>
> Prof James Hendler
>    http://www.cs.rpi.edu/~hendler
> Tetherless World Constellation Chair & Asst Dean of IT and Web Science
> Computer and Cognitive Science Depts
> Rensselaer Polytechnic Institute, Troy NY 12180         @jahendler, twitter
>
>
>
>
>
>
>
>
>
>



-- 
Jie Bao
http://www.cs.rpi.edu/~baojie
Received on Tuesday, 4 August 2009 15:19:56 GMT

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