Re: Meaning of identifierSpace and schemaSpace

David,

(sorry for pulling you into this convo)

Do you happen to have any additional knowledge or clarification for the
definitions of identiferSpace and schemaSpace in Reconciliation ? (my
memory is fading fast)

Thad
https://www.linkedin.com/in/thadguidry/


On Tue, Sep 24, 2019 at 9:07 AM Thad Guidry <thadguidry@gmail.com> wrote:

> Historically in Freebase the Types themselves were grouped under Domains
> sometimes.
>
> We had Domains like /business and /music etc.
> and each Type in the Domain (like "artist") had an ID that showed which
> domain it was under like this Type "/music/artist".
>
> Then the more general concept was namespaces and keys
> https://developers.google.com/freebase/guide/basic_concepts
>
> Wikidata Items directly translate to Freebase Topic MIDs ( like /m/0dgw9r
> <https://tools.wmflabs.org/freebase/m/0dgw9r> )
>
> OId MQL ... but this might help you understand... When you inserted a new
> value into Freebase you would get back the identifier MID of the triple, in
> this case upon inserting the key value "eol" into the "/biology" namespace
> (which is essentially a Domain)
>
> [{
>   "id":   "/m/0cnstys",
>   "type": "/type/namespace",
>   "key": [{
>     "connect":   "insert",
>     "namespace": "/biology",
>     "value":     "eol"
>   }]
> }]
>
>
> https://groups.google.com/forum/#!searchin/freebase-discuss/jeff$20prucher$20authority|sort:date/freebase-discuss/qiKeBzTMsks/rDtwPUNDClQJ
>
>
>
> https://groups.google.com/forum/#!searchin/freebase-discuss/jeff$20prucher$20authority|sort:date/freebase-discuss/WdwYwZKSLtM/6Qc5EosrG28J
>
>
>
> https://groups.google.com/forum/#!searchin/freebase-discuss/jeff$20prucher$20authority|sort:date/freebase-discuss/OoRk6BsxWyQ/jCXs-PSn3woJ
>
>
>
> https://groups.google.com/forum/#!searchin/freebase-discuss/mql$20namespace|sort:date/freebase-discuss/KMQRKrcTYck/zPKBnyncOj4J
>
>
> *My initial reaction is that the schemaSpace is more about Domains and
> that the identifierSpace is about namespaces and keys* (where we stored
> unique identifiers and was the old soft key system).
> Since Wikidata has no direct Types or Domains, there is nothing to
> translate there I think.
>
> Thad
> https://www.linkedin.com/in/thadguidry/
>
>
> On Tue, Sep 24, 2019 at 5:15 AM Antonin Delpeuch <antonin@delpeuch.eu>
> wrote:
>
>> Hi all,
>>
>> I have a question about the exact meaning of the identifierSpace and
>> schemaSpace fields in reconciliation services. This is one thing I would
>> like document better in the specifications.
>>
>> My understanding is that these are URIs which represent the type of
>> entities and properties used by the service. Can we have a more precise
>> definition than that?
>>
>> The canonical value for both of these is
>> "http://rdf.freebase.com/ns/type.object.id", which was used in the
>> Freebase reconciliation service, but can of course no longer be accessed
>> (if it ever was? sometimes URIs are not meant to be resolved in a
>> browser).
>>
>> This canonical value is used by many other reconciliation services, even
>> if they do not use Freebase ids at all: for instance, the OCCRP endpoint
>> uses it. Is it desirable?
>>
>> In the Wikidata service I have used "http://www.wikidata.org/entity/" as
>> identifierSpace and "http://www.wikidata.org/prop/direct/" as
>> schemaSpace. The idea behind this choice was that you can get a RDF URI
>> for identifiers and properties by concatenating their ids to these
>> prefixes. But that was totally a guess on my part. Perhaps I should have
>> used actual URIs there? Which ones?
>>
>> So, in short, I would like a precise definition of the identifierSpace
>> and schemaSpace fields, which would unambiguously inform implementers
>> about what value they should have in their own services.
>>
>> Thanks,
>>
>> Antonin
>>
>>
>>
>>