Hi, Kingsley!
Thanks for the suggestion. Virtuoso's faceted browser certainly does allow
you to browse the data. But I've looked at the URIs in the examples you
provided and AFAIK it won't give those nice dereferenceable URIs as
required and described in the Linked Data API spec [1], and seen on the
UK's linked data efforts (e.g. [2], [3]).
The only Linked Data API implementations I've found so far are Elda [4]
(Java) and Puelia [5] (PHP). So far we've been using Elda, with
satisfactory results.
[1] http://code.google.com/p/linked-data-api/wiki/Specification
[2] http://education.data.gov.uk/
[3] http://environment.data.gov.uk/doc/bathing-water/ukl1702-36800
[4] http://code.google.com/p/elda/
[5] http://code.google.com/p/puelia-php/
Best regards,
Augusto Herrmann
On Thu, Jan 10, 2013 at 5:24 PM, Kingsley Idehen <[email protected]>wrote:
> On 1/10/13 12:23 PM, Augusto Herrmann wrote:
>
> Hi, Chris and Kingsley,
>
> thanks for the tip! We got it working now by adding the triple [1]:
>
> <http://orcamento.dados.gov.br/sparql/> elda:supportsNestedSelect true .
>
> The SPARQL query generated by Elda is much simpler, now. Works
> beautifully.
>
> [1]
> http://dev.dados.gov.br/codigo/outros/orcamento-linked-data/changeset/0eb507b1a891033cfbb60c985ccbe6017df2d435#aspecsorcamentottl_n28<http://dev.dados.gov.br/codigo/outros/orcamento-linked-data/changeset/0eb507b1a891033cfbb60c985ccbe6017df2d435>
>
>
> Great!
>
> Why not install Virtuoso's faceted browser engine [1], via the Faceted
> Browser VAD so that you have a powerful Precision Search & Find service in
> place. Examples:
>
> 1. http://beta.bio2rdf.org/ -- note the "search" option links
> 2. http://bit.ly/ZLt002 -- LOD Cloud Analytics re. UK Schools by Authority
> 3. http://bit.ly/WSkaav <http://bit.ly/UqyqZa> -- LOD Cloud Analytics
> re. UK Schools by District .
>
> Links:
>
> 1.
> http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtFacetBrowserInstallConfig.
>
>
> Kingsley
>
>
> Best regards,
> Augusto Herrmann
>
> On Thu, Jan 10, 2013 at 12:35 PM, Kingsley Idehen
> <[email protected]>wrote:
>
>> On 1/10/13 7:44 AM, chris dollin wrote:
>>
>>> On 10 January 2013 12:03, Augusto Herrmann <[email protected]>
>>> wrote:
>>>
>>>> Greetings!
>>>>
>>>> We're implementing a Linked Data API for the Brazilian federal budget
>>>> [1],
>>>> using Elda, in a similar way the UK government has done with some of its
>>>> open data. It's still in an early alpha stage, though. What we're having
>>>> difficulty with is defining the Views for the item-de-despesa [2]. In
>>>> our
>>>> spec [3], we can's even list all the properties lest the SPARQL query
>>>> becomes too complex for Virtuoso to handle. Even with only a few
>>>> properties,
>>>> if the user chooses to list 25 or more items per page, the query breaks.
>>>>
>>>> We've looked at the schools example view [4] and it looks quite
>>>> similar, but
>>>> the generated SPARQL query is much simpler. Does any one have a clue on
>>>> what's wrong with the views we're defining?
>>>>
>>>> [1] http://orcamento.dados.gov.br/
>>>> [2] http://orcamento.dados.gov.br/doc/item-de-despesa
>>>> [3]
>>>>
>>>> http://dev.dados.gov.br/codigo/outros/orcamento-linked-data/files/305212de5f6852e447ea13bae4afa5cbf47f99b5/specs/orcamento.ttl#L47
>>>> [4]
>>>>
>>>> http://code.google.com/p/linked-data-api/source/browse/trunk/examples/config/education.data.gov.uk.ttl#35
>>>>
>>> Does Virtuoso implemented nested SELECTS and have you enabled them
>>> in your Elda config?
>>>
>>> Without nested selects, the core of a View query is repeated for every
>>> selected item. If the view core is big, the entire query is enormous, and
>>> can blow up buffers between Elda and the SPARQL endpoint. "Enormous"
>>> meaning multiple megabytes.
>>>
>>> Which is why Elda has the nested select option ...
>>>
>>> Chris
>>>
>>> (Stuart may have some other ideas.)
>>>
>>>
>> Add virtuoso list to the cc.
>>
>> Virtuoso supports SPARQL subqueries. I've provided an example here:
>> http://bit.ly/UNaKyA .
>>
>>
>> --
>>
>> Regards,
>>
>> Kingsley Idehen
>> Founder & CEO
>> OpenLink Software
>> Company Web: http://www.openlinksw.com
>> Personal Weblog: http://www.openlinksw.com/blog/~kidehen
>> Twitter/Identi.ca handle: @kidehen
>> Google+ Profile: https://plus.google.com/112399767740508618350/about
>> LinkedIn Profile: http://www.linkedin.com/in/kidehen
>>
>>
>>
>>
>>
>>
>
>
> --
>
> Regards,
>
> Kingsley Idehen
> Founder & CEO
> OpenLink Software
> Company Web: http://www.openlinksw.com
> Personal Weblog: http://www.openlinksw.com/blog/~kidehen
> Twitter/Identi.ca handle: @kidehen
> Google+ Profile: https://plus.google.com/112399767740508618350/about
> LinkedIn Profile: http://www.linkedin.com/in/kidehen
>
>
>
>
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