Hi,
There was a typo in the query, so only the inverse path results were
shown. Here is a link to the results for the subject to object path that
is limited at 5000. http://tinyurl.com/zhw77eu
Cheers,
Christopher Johnson
On 24 April 2016 at 13:49, Christopher Johnson <chjohnso...@gmail.com>
wrote:
> Hi,
>
> It is worth noting that I understand with property paths (SPARQL 1.1), one
> can do transitive queries simply by adding a + to the property (z.B.
> wdt:P171+). However, this rule set method for Virtuoso also adds cohesion
> of different subclass properties under rdfs:subClassOf, so it is much more
> simple to use and scales better.
>
> Here is an example of a "downward expansion" of the taxonomic rank tree
> starting from "domain" that does not use the input:inference method, but
> rather property paths and the transitive query option of Virtuoso. The
> result set expands the tree along the P361 property path.
> http://tinyurl.com/h5hv2f6
>
> select distinct ?s ?o ?label where {
> { select ?s where { VALUES(?s) {(wd:Q146481)} } }
> { select ?s ?o ?label where { ?s wdt:361|^wdt:P361 ?o .
> ?o rdfs:label ?label FILTER (lang(?label) = "en") } } option
> (TRANSITIVE, T_IN (?s), T_OUT (?o), T_DISTINCT) }
>
> I do not think that this transitive class expansion method is possible to
> do with the DBpedia taxonomic ontology (please correct me if I am mistaken
> about this). However, it might be possible to UNION multiple property path
> result sets with TPF.
>
> Cheers,
> Christopher Johnson
>
>
> On 23 April 2016 at 14:35, Christopher Johnson <chjohnso...@gmail.com>
> wrote:
>
>> Hi Dimitris,
>>
>> Thank you for your reply and assistance. I have solved the subclass
>> inference problem with Wikidata that is a problem for comparison of
>> taxonomic terms between Wikidata and DBpedia. The method is quite simple
>> and it might be useful for DBpedia to implement for the taxon classes and
>> for other ontological subclass relationships. The main problem is with
>> transitivity. In order to enable transitive inferencing in Virtuoso, a
>> rule set needs to be created. For the Wikidata taxons, this looks like
>> this:
>>
>> rdfs:subClassOf rdf:type owl:TransitiveProperty .
>> wdt:P171 rdf:type owl:TransitiveProperty .
>> wdt:P279 rdf:type owl:TransitiveProperty .
>> wdt:P361 rdf:type owl:TransitiveProperty .
>> wdt:P171 owl:sameAs rdfs:subClassOf .
>> wdt:P279 owl:sameAs rdfs:subClassOf .
>> wdt:P361 owl:sameAs rdfs:subClassOf .
>>
>> to add it to virtuoso, use the rdfs_ruleset() command. I have enabled it
>> on my test instance http://wdm-rdf.wmflabs.org/sparql.
>>
>> An example query, is this http://tiny.cc/38j0ay that finds all of the
>> subclasses of the "domain" taxon rank.
>> The query looks like this:
>>
>> DEFINE input:inference 'http://wdm-rdf.wmflabs.org/w3/rule_set/rdfs/trans
>> '
>> SELECT DISTINCT ?taxon ?label WHERE {?taxon rdfs:subClassOf wd:Q146481;
>> rdfs:label ?label FILTER (lang(?label) = "en")}
>>
>> Hope this is useful.
>>
>> Best Regards,
>> Christopher Johnson
>>
>> On 20 April 2016 at 11:41, Dimitris Kontokostas <jimk...@gmail.com>
>> wrote:
>>
>>> Hi Christopher,
>>>
>>> this definitely looks promising. I posted some comments on your idea to
>>> give you some direction.
>>> We recently created wikidata.dbpedia.org that can help with the diffing
>>> / merging etc
>>> here's a version http://arxiv.org/abs/1507.04180 (we plan an updated
>>> version soon)
>>>
>>> please have a look at that work and we can discuss ways to improve /
>>> collaborate etc
>>>
>>> On Thu, Apr 14, 2016 at 7:10 PM, Christopher Johnson <
>>> chjohnso...@gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> I have posted my idea for federating wikidata and dbpedia here:
>>>> http://wiki.dbpedia.org/ideas/idea/248/federating-wikidata-and-dbpedia-with-triple-pattern-fragments/
>>>>
>>>> The method works. I think that this could provide a helpful supplement
>>>> to both Wikidata and DBpedia. The primary use case is for diffing,
>>>> comparison and merging of Wikidata values with DBpedia values for the same
>>>> resource concept. An inexpensive validation method is definitely needed to
>>>> ensure balance between these increasingly disparate data sources.
>>>>
>>>> Much work still remains, but this seems to offer a promising way
>>>> forward.
>>>>
>>>> Christopher Johnson
>>>>
>>>>
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>>>>
>>>
>>>
>>> --
>>> Kontokostas Dimitris
>>>
>>
>>
>
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