IVOA Thesaurus

[Frederic V. Hessman]

Many heartfelt thanks to Doug and Alasdair!   I'll not make any  
changes to IVOAT until you can provide your best attempt at a rules  
file.

Does this mean that I can then routinely run cwm to produce  
automatically the official SKOS file with all the loose ends taken  
care of?

Rick

On 31 Oct 2007, at 12:46 pm, Alasdair Gray wrote:

> Hi Doug,
>
> Good work with the cwm rules :)
>
> I have just extended your rules to apply one for making the  
> skos:related
> relationship symmetrical. The new rule file can be found at
> http://explicator.dcs.gla.ac.uk/Vocabularies/inferRelationships.n3
>
> To help those who are struggling to get cwm working on their machines
> (it can be a bit of a beast to get working), I have run Rick's version
> through cwm to produce a base rdf version. This can be found at
> http://explicator.dcs.gla.ac.uk/Vocabularies/IVOAT- 
> relationships_2007-10
> -30.rdf. This was generated by the command:
> cwm
> http://www.astro.physik.uni-goettingen.de/~hessman/rdf/IVOAT/IVOAT.rdf
> --rdf >
> http://explicator.dcs.gla.ac.uk/Vocabularies/IVOAT- 
> relationships_2007-10
> -30.rdf
>
> A version of the thesaurus with Doug's rules applied for the
> broader/narrower but not mine can be found at
> http://explicator.dcs.gla.ac.uk/Vocabularies/IVOAT 
> +relationships_2007-10
> -30.rdf. This was generated by the command:
> cwm
> http://www.astro.physik.uni-goettingen.de/~hessman/rdf/IVOAT/IVOAT.rdf
> --think=http://hea-www.harvard.edu/~dburke/playground/infer.n3 --rdf >
> http://explicator.dcs.gla.ac.uk/Vocabularies/IVOAT 
> +relationships_2007-10
> -30.rdf
>
> Finally, the version with the broader/narrower and the related
> relationships inferred can be found at
> http://explicator.dcs.gla.ac.uk/Vocabularies/IVOAT 
> +relationships2_2007-1
> 0-30.rdf. This was generated by the command:
> cwm
> http://www.astro.physik.uni-goettingen.de/~hessman/rdf/IVOAT/IVOAT.rdf
> --think=http://explicator.dcs.gla.ac.uk/Vocabularies/ 
> inferRelationships.
> n3 --rdf >
> http://explicator.dcs.gla.ac.uk/Vocabularies/IVOAT 
> +relationships2_2007-1
> 0-30.rdf
>
> Doing some comparisons with a merge tool is quite interesting.  
> However,
> you will note that there are lots of skos:changeNote added even though
> there has not been a change. I will see if I can amend the rules to  
> only
> generate output when there is not an existing triple.
>
> Cheers,
>
> Alasdair
>
>
>
> Alasdair J G Gray
> Research Associate: Explicator Project
> http://explicator.dcs.gla.ac.uk
> Computer Science, University of Glasgow
> 0141 330 6292
>
> -----Original Message-----
> From: owner-semantics at eso.org [mailto:owner-semantics at eso.org] On  
> Behalf
> Of Douglas Burke
> Sent: 30 October 2007 20:35
> To: Frederic V. Hessman
> Cc: IVOA semantics
> Subject: Re: IVOA Thesaurus
>
> Frederic V. Hessman wrote:
>>
>
>>> My second issue is to do with maintenance. In going through the
>>> vocabulary I have found quite a few errors that have crept in due to
>>> the editing process. (The list can be found at the bottom of this
>>> email.) Some of these are simple typos but others are where
>>> identifiers have been changed for a concept and the subsequent edits
>>> have not been made for all of the relationships involving that edit.
>>> Others make the vocabulary poly-hierarchy inconsistent, e.g.
>>> acceleration of gravity has gravity as a broader term but the  
>>> inverse
>
>>> relation is not present in gravity. I think that we need to develop
>>> scripts that can check that the inverses of all of the relationships
>>> that are declared in the hierarchy are present. This would be based
> on
>>> the related relationship being symmetrical and the broader/narrower
>>> being inverses of each other.
>>>
>> I have made very little effort to correct the consistency of BT's and
>> NT's, thinking like Alasdair, that someone will use a much fancier
> tool
>> which spits out the correct list.
>>
>> Note, however, that total consitency is only really important when  
>> the
>
>> thesaurus is more-or-less finished in it's final working-draft form.
>
> In the spirit of "why not use a sledge hammer to crack a walnut", I've
> just tried automatically adding skos:broader/narrower terms for those
> that are missing, using cwm and assuming that the terms are  
> inverses of
> each other.
>
> The magic - once you have cwm installed [1,2] - is
>
> % cwm
> http://www.astro.physik.uni-goettingen.de/~hessman/rdf/IVOAT/IVOAT.rdf
> --think=http://hea-www.harvard.edu/~dburke/playground/infer.n3 --rdf >
> ivoa.infer.rdf
>
> or
>
> % cwm
> http://www.astro.physik.uni-goettingen.de/~hessman/rdf/IVOAT/IVOAT.rdf
> --filter=http://hea-www.harvard.edu/~dburke/playground/infer.n3 -- 
> rdf >
> ivoa.additions.rdf
>
> and the output files are at
>
> http://hea-www.harvard.edu/~dburke/playground/ivoa.infer.rdf
> http://hea-www.harvard.edu/~dburke/playground/ivoa.additions.rdf
>
> where the first version is the full set of terms (ie Rick's "Tue  
> Oct 30
> 09:44:06 2007" version with my additions) and the second one is  
> just the
>
> set of additions made.
>
> The rules I used for this are shown below. Not exactly rocket science
> ;-)
> Doug
>
> [1] http://www.w3.org/2000/10/swap/doc/CwmInstall
> [2] http://dig.csail.mit.edu/2007/Talks/0110-rules-tbl/
>
> --- infer.n3 ---
>
> @prefix skos: <http://www.w3.org/2004/02/skos/core#> .
> @prefix :
> <http://www.Astro.physik.Uni-Goettingen.DE/~hessman/rdf/IVOAT#> .
> @prefix string: <http://www.w3.org/2000/10/swap/string#>.
>
>
> {
>    ?x skos:narrower ?y .
>    ("DJB: added skos:broader term for '" ?x.skos:prefLabel "'
> (2007-OCT-30)")
>           string:concatenation  ?s.
> }
> =>
> {
>    ?y skos:broader ?x ;
>       skos:changeNote ?s .
> } .
>
> {
>    ?x skos:broader ?y .
>    ("DJB: added skos:narrower term for '" ?x.skos:prefLabel "'
> (2007-OCT-30)")
>           string:concatenation  ?s.
> }
> =>
> {
>    ?y skos:narrower ?x ;
>       skos:changeNote ?s .
> } .