- From: Curt Tilmes <Curt.Tilmes@nasa.gov>
- Date: Fri, 21 Dec 2012 06:20:55 -0500
- To: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
- CC: Tom De Nies <tom.denies@ugent.be>, Stephan Zednik <zednis@rpi.edu>, "public-prov-wg@w3.org" <public-prov-wg@w3.org>
I agree -- ternary is much cleaner/simpler. How about HadDictMember just to tie it more closely with Dictionary while keeping the relationship (of the relationship) with HadMember clear? Curt On 12/21/12 3:19 AM, Luc Moreau wrote: > Hi Tom > I agree with your analysis. Looks like we are back to a ternary relation. > I would think about its name though. HadIndexedMember? HadKeyedMember? > > Professor Luc Moreau > Electronics and Computer Science > University of Southampton > Southampton SO17 1BJ > United Kingdom > > On 21 Dec 2012, at 06:14, "Tom De Nies" <tom.denies@ugent.be<mailto:tom.denies@ugent.be>> wrote: > > > Hello all, thanks for your feedback so far. > > I think it's important to remark that hadMember for a Dictionary is fundamentally different than for Collection. > To me, it's crucial that we associate the key with the membership relation, rather than with the entity, as Curt suggested. > The suggestions using specialization seem like overkill to me, and will just throw off any users that were considering PROV-Dictionary. > It's a pity really that hadMember can't have any additional attributes, even when we're designing an extension to PROV-DM, because for me, the following would be perfect: > > entity(d1, [prov:type="prov:Dictionary"]) > entity(e1) > hadMember(d1, e1, [prov:key="k1"]) > > If we can't do that, I suggest we introduce something along the lines of the following: > > entity(d1, [prov:type="prov:Dictionary"]) > entity(e1) > hadKeyEntity(d1, e1, [prov:key="k1"]) > > and then add the following inference to the constraints: > IF hadKeyEntity(d1, e1, [prov:key="k1"]) THEN hadMember(d1, e1) > > Any thoughts on this? > > - Tom > > > 2012/12/20 Stephan Zednik <zednis@rpi.edu<mailto:zednis@rpi.edu>> > I believe Tim and myself had discussed a similar line of reasoning to what Curt is suggesting when we were trying to see how Dictionary membership could work in PROV-O (before Dictionary was split out into its own note). > > We were at the time trying to use a unified non-qualified membership relation that worked for dictionaries as well as general collections. In PROV-O this lead to the question of where does the key information reside? > > Right now I like the idea of > > hadMember(d1, e1, "k1") > > The dictionary note can define the attribute prov:dictKey which is used in a membership relation when the collection is a dictionary. We may want to define a new relation such as hadDictionaryMember( ) so we are not overloading the existing membership relation. > > I am still not completely sure about what to do with unqualified dictionary membership properties in PROV-O. Perhaps one is simply not defined for dictionaries? > > --Stephan > > On Dec 20, 2012, at 8:24 AM, Luc Moreau <l.moreau@ecs.soton.ac.uk<mailto:l.moreau@ecs.soton.ac.uk>> wrote: > >> >> It would work, but feels heavy. >> >> I personally prefer the original design. >> >> Luc >> >> On 12/20/2012 03:17 PM, Curt Tilmes wrote: >>> >>> Specialization? >>> >>> entity(d1, [prov:type='prov:Dictionary']) >>> entity(d2, [prov:type='prov:Dictionary']) >>> >>> entity(e1) >>> >>> specializationOf(e1_1, e1) >>> entity(e1_1, [prov:key='k1']) >>> hadMember(d1, e1_1) >>> >>> specializationOf(e1_2, e1) >>> entity(e1_2, [prov:key='k2']) >>> hadMember(d2, e1_2) >>> >>> Gets kind of ugly though.. >>> >>> Curt >>> >>> On 12/20/2012 09:49 AM, Luc Moreau wrote: >>>> >>>> Hi Curt, >>>> >>>> What if e1 belongs to two dictionaries, with keys k1 and k2, respectively? >>>> >>>> Luc >>>> >>>> On 12/20/2012 02:44 PM, Curt Tilmes wrote: >>>>> hadMember(c,e) can't have additional attributes or other arguments. >>>>> >>>>> You could do something like: >>>>> >>>>> entity(d, [prov:type='prov:Dictionary']) >>>>> entity(e1, [prov:key='k1']) >>>>> hadMember(d, e1) >>>>> >>>>> This adds prov:key to the 'prov:' namespace, but that should be ok, >>>>> since we've said Notes can do so. >>>>> >>>>> We could make it a little more specific to Dictionaries with >>>>> "prov:dictkey='k1'". >>>>> >>>>> >>>>> I'm also not sure what to do with multiple membership like: >>>>> >>>>> d = [(k1, e1), (k2, e1)] >>>>> >>>>> (Just give it two "prov:key"s?) >>>>> >>>>> Curt >>>>> >>>>> On 12/20/2012 09:23 AM, Tom De Nies wrote: >>>>>> Hello Luc, >>>>>> >>>>>> I understand your concern, and it's something we can address before >>>>>> proceeding. During the last telecon, we motivated our desire to redesign >>>>>> the original memberOf relation of Dictionary. Basically, we'd like >>>>>> consistency with Collection membership. >>>>>> >>>>>> Would the notation hadMember(d1, e1, "k1") address you concern? (without >>>>>> the brackets) >>>>>> In essence, this adds one attribute to the Collection membership for >>>>>> Dictionary. It also would mean minimal changes througout the document. >>>>>> >>>>>> Tom >>>>>> >>>>>> On Dec 20, 2012 3:07 PM, "Luc Moreau" <l.moreau@ecs.soton.ac.uk<mailto:l.moreau@ecs.soton.ac.uk> >>>>>> <mailto:l.moreau@ecs.soton.ac.uk<mailto:l.moreau@ecs.soton.ac.uk>>> wrote: >>>>>> >>>>>> Hi Tom and Sam, >>>>>> >>>>>> Sorry for the delay. >>>>>> I have some concerns about the proposed membership relation. >>>>>> >>>>>> PROV requires members of a collection to be entities. >>>>>> http://www.w3.org/TR/2012/CR-prov-dm-20121211/#concept-collection >>>>>> >>>>>> Given this, your relation >>>>>> hadMember(d, ("k1", e1)) >>>>>> seems to indicate that ("k1",e1) is also an entity. >>>>>> >>>>>> It's not how I had initially envisaged this to work. I see e1 as an >>>>>> entity >>>>>> belonging to the dictionary d, with "k1" it's key. >>>>>> So, in my view, we have: >>>>>> hadMember(d,e1) >>>>>> but not >>>>>> hadMember(d,("k1",e1)) >>>>>> >>>>>> If ("k1",e1) is an entity, what is its identifier? >>>>>> >>>>>> Grammatically, hadMember(d,("k1",e1)) is not compatible with the >>>>>> prov-n notation, since the second argument of hadMember has to >>>>>> be a qualified name (the identity of the member). >>>>>> >>>>>> To me, it's important that we address this issue, before going into >>>>>> a review. >>>>>> >>>>>> Luc >>>>>> >>>>>> >>>>>> On 12/18/2012 04:03 PM, Tom De Nies wrote: >>>>>>> Specific questions we have for reviewers are: >>>>>>> >>>>>>> 1. Is the notation of Dictionary concepts clear & acceptable for >>>>>>> you? (in PROV-N and PROV-O) >>>>>>> 2. Are the constraints acceptable, or are they too loose/too >>>>>>> strict? >>>>>>> 3. Are you happy with the solution to the issue regarding >>>>>>> completeness? (Tracing back to an EmptyDictionary) >>>>>>> 4. Is the note ready to be published as FPWD? >>>>>>> >>>>>>> We would like to end the internal review after the first week of >>>>>>> the new year. >>>>>>> >>>>>>> Thanks everyone, and happy holidays! >>>>>>> >>>>>>> Tom >>>>>>> >>>>>>> 2012/12/18 Sam Coppens Ugent <sam.coppens@ugent.be<mailto:sam.coppens@ugent.be> >>>>>>> <mailto:sam.coppens@ugent.be<mailto:sam.coppens@ugent.be>>> >>>>>>> >>>>>>> Hello everybody, >>>>>>> >>>>>>> The Dictionary Note >>>>>>> (http://dvcs.w3.org/hg/prov/raw-file/default/dictionary/prov-dictionary.html) >>>>>>> has been finalised for review. Feedback on the note is welcome. >>>>>>> Could everybody also check the authors of the document? If >>>>>>> someone is missing, let us know. >>>>>>> >>>>>>> Thanks a lot! >>>>>>> >>>>>>> Best Regards, >>>>>>> >>>>>>> Sam & Tom >>>>>> >>>>>> -- >>>>>> Professor Luc Moreau >>>>>> Electronics and Computer Science tel:+44 23 8059 4487<tel:%2B44%2023%208059%204487> >>>>>> <tel:%2B44%2023%208059%204487> >>>>>> University of Southampton fax:+44 23 8059 2865<tel:%2B44%2023%208059%202865> >>>>>> <tel:%2B44%2023%208059%202865> >>>>>> Southampton SO17 1BJ email:l.moreau@ecs.soton.ac.uk<mailto:email%3Al.moreau@ecs.soton.ac.uk> >>>>>> <mailto:l.moreau@ecs.soton.ac.uk<mailto:l.moreau@ecs.soton.ac.uk>> >>>>>> United Kingdomhttp://www.ecs.soton.ac.uk/~lavm<http://www.ecs.soton.ac.uk/~lavm> >> >> -- >> Professor Luc Moreau >> Electronics and Computer Science tel: +44 23 8059 4487<tel:%2B44%2023%208059%204487> >> University of Southampton fax: +44 23 8059 2865<tel:%2B44%2023%208059%202865> >> Southampton SO17 1BJ email: l.moreau@ecs.soton.ac.uk<mailto:l.moreau@ecs.soton.ac.uk> >> United Kingdom http://www.ecs.soton.ac.uk/~lavm >> >> >> > >
Received on Friday, 21 December 2012 11:22:09 UTC