W3C home > Mailing lists > Public > public-rww@w3.org > March 2016

Re: Best practices for linking two ldp servers

From: Melvin Carvalho <melvincarvalho@gmail.com>
Date: Tue, 22 Mar 2016 11:05:48 +0100
Message-ID: <CAKaEYhJz_qtvRx1POKJySP+ovxGhWWgX4urib4GeWsQNEBFd4g@mail.gmail.com>
To: Brent Shambaugh <brent.shambaugh@gmail.com>
Cc: public-rww <public-rww@w3.org>
On 19 March 2016 at 15:50, Brent Shambaugh <brent.shambaugh@gmail.com>
wrote:

> or, just making sure I associate bshambaugh.rww.io/profile/card#me
> owl:sameAs http://bshambaugh.org/foaf.rdf#me and have that somehow
> associated with everything that is related to me in those two respective
> data sources...how do i make sure of that?
>

That looks right.  What it means is that both URIs denote the same Person,
ie you.


>
> -Brent Shambaugh
>
> Website: bshambaugh.org
>
> On Sat, Mar 19, 2016 at 10:33 AM, Brent Shambaugh <
> brent.shambaugh@gmail.com> wrote:
>
>> Using scipeople:hasAuthored for each individual related triple would it
>> seems, but that is painful. Or maybe not, as long as I tell the computer to
>> do it :).
>>
>> -Brent Shambaugh
>>
>> Website: bshambaugh.org
>>
>> On Sat, Mar 19, 2016 at 10:29 AM, Brent Shambaugh <
>> brent.shambaugh@gmail.com> wrote:
>>
>>> Thank you Melvin and Markus. Here are my thoughts.
>>>
>>> With owl:sameAs I can only link to my name or something very similar in
>>> a different datasource. This could be perfectly fine, but my intention
>>> might be to link to a collection of triples (say on a LDP server) because I
>>> mean to direct the focus there. This might be built on the fly if I know ,
>>> or am able to infer every other triple that was linked by creating the
>>> owl:sameAs link.
>>>
>>> Maybe more generally I might say bshambaugh.org/foaf.rdf#me
>>> scipeople:hasAuthored  http://bshambaugh.rww.io/ (great because it
>>> could include multiple authors). A problem with this could be that it is
>>> not generally recognized as a link in the linked data world. As an example,
>>> I was using LodLive the other day, and it was programmaticly constrained to
>>> follow only certain links (this makes sense b/c otherwise the graph would
>>> be a mess to see). Perhaps rdfs:seeAlso could do, but it does not tell me
>>> much semantically beyond a hyperlink IMHO.
>>> If I wanted to create two LDP containers and have them be essentially
>>> the same, then I could say http://localhost:8080/marmotta/ldpBrentsRWW-1
>>> owl:sameAs http://bshambaugh.rww.io/ . I could then include this in
>>> other LDP containers. I might want to however build a set of triples that
>>> were associated with me that exist somewhere regardless of where they are
>>> stored. Working at the document level of linking LDP containers might not
>>> do the trick. Using scipeople:hasAuthored for each individual related
>>> triple would it seems, but that is painful.
>>>
>>>
>>> @prefix scipeople: <http://lod.taxonconcept.org/ontology/sci_people.owl>
>>>
>>> -Brent Shambaugh
>>>
>>> Website: bshambaugh.org
>>>
>>> On Sat, Mar 19, 2016 at 5:52 AM, Markus Sabadello <
>>> markus@projectdanube.org> wrote:
>>>
>>>> Reminds me of this (several years old) paper by Harry Halpin and others:
>>>> https://www.w3.org/2009/12/rdf-ws/papers/ws21
>>>>
>>>> "When owl:sameAs isn’t the Same: An Analysis of Identity Links on the
>>>> Semantic Web"
>>>>
>>>> It argues that people have been using owl:sameAs for four slightly
>>>> different purposes:
>>>> - Same Thing As But Referentially Opaque
>>>> - Same Thing As But Different Context
>>>> - Represents
>>>> - Very Similar To
>>>>
>>>> Markus
>>>>
>>>>
>>>> On 19.03.2016 10:14, Melvin Carvalho wrote:
>>>>
>>>>
>>>>
>>>> On 19 March 2016 at 01:30, Brent Shambaugh <brent.shambaugh@gmail.com>
>>>> wrote:
>>>>
>>>>> I just found it was wicked cool that I could link another linked data
>>>>> platform server from another. I was messing around and I inserted
>>>>> owl:sameAs. Is there a best practice? Please ignore my other nonsensical
>>>>> triples :)
>>>>>
>>>>
>>>> Yes, exactly owl : sameAs allows two URIs to be the same.
>>>>
>>>>
>>>>>
>>>>> curl -iX POST -H "Content-Type: text/turtle"     -H "Slug:
>>>>> BrentsRWW"     --data @/var/www/data/brentrww.ttl
>>>>> http://localhost:8080/marmotta/ldp/
>>>>>
>>>>> with
>>>>>
>>>>> HTTP/1.1 201 Created
>>>>> Server: Apache Marmotta/3.3.0 (build 0)
>>>>> ETag: W/"1458340352000"
>>>>> Last-Modified: Fri, 18 Mar 2016 22:32:32 GMT
>>>>> Link: <
>>>>> http://wiki.apache.org/marmotta/LDPImplementationReport/2014-09-16>;
>>>>> rel="http://www.w3.org/ns/ldp#constrainedBy"
>>>>> Link: <http://www.w3.org/ns/ldp#Resource>; rel="type"
>>>>> Link: <http://www.w3.org/ns/ldp#RDFSource>; rel="type"
>>>>> Link: <http://www.w3.org/ns/ldp#Container>; rel="type"
>>>>> Link: <http://www.w3.org/ns/ldp#BasicContainer>; rel="type"
>>>>> Location: http://localhost:8080/marmotta/ldp/BrentsRWW-1
>>>>> Content-Length: 0
>>>>> Date: Fri, 18 Mar 2016 22:32:32 GMT
>>>>>
>>>>> cat brentrww.ttl
>>>>>
>>>>> @prefix dc: <http://purl.org/dc/terms/> .
>>>>> @prefix foaf: <http://xmlns.com/foaf/0.1/> .
>>>>> @prefix owl: <http://www.w3.org/2002/07/owl#> .
>>>>>
>>>>> <> a foaf:PersonalProfileDocument;
>>>>>     foaf:primaryTopic <#me> ;
>>>>>     dc:title 'Brent Files' .
>>>>>
>>>>
>>>> Great use of primary topic here!
>>>>
>>>>
>>>>>
>>>>> <#me> a foaf:Person;
>>>>>     foaf:name 'Brent Shambaugh Files'  ;
>>>>>     owl:sameAs <http://bshambaugh.rww.io> .
>>>>>
>>>>
>>>> You'd probably want to link the sameAs to the corresponding #me value
>>>> in the second server, rather than the root document.
>>>>
>>>> It is better to associate data with data, rather than, data with
>>>> documents.  Documents are the delivery mechanism for data.  We should
>>>> possibly right an FAQ on this, as it can be a source of confusion sometimes
>>>> when starting out with linked data.
>>>>
>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> -Brent Shambaugh
>>>>>
>>>>> Website: bshambaugh.org
>>>>>
>>>>
>>>>
>>>>
>>>>
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>>>
>>
>
Received on Tuesday, 22 March 2016 10:06:19 UTC

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