Hi Alexander,
Did you run the DB.DBA.RDF_GEO_FILL () procedure to create the geometry
data/predicates for the loaded LGD datasets as detailed at:
http://docs.openlinksw.com/virtuoso/rdfsparqlgeospat.html#rdfsparqlgeospatcrg
As if the "geometry" predicates do not exist, this would seem the most likely
cause ...
Best Regards
Hugh Williams
Professional Services
OpenLink Software
Web: http://www.openlinksw.com
Support: http://support.openlinksw.com
Forums: http://boards.openlinksw.com/support
Twitter: http://twitter.com/OpenLink
On 18 May 2010, at 12:01, Alexander Sidorov wrote:
> Hi Hugh,
>
> There wasn't any error. As there isn't "geometry" predicate at my instance,
> Virtuoso doesn't find assertions with it and returns empty result set. Just
> compare:
> 1. endpoint: lod.openlinksw.com/sparq
> query: SELECT * WHERE
> {<http://linkedgeodata.org/triplify/node/163043169#id> ?p ?o .}
> 2. endpoint: http://ec2-184-73-209-65.compute-1.amazonaws.com/sparql
> query: SELECT * FROM <http://linkedgeodata.org/content#> WHERE
> {<http://linkedgeodata.org/triplify/node/163043169#id> ?p ?o .}
>
> "geometry" predicate exists in the first case but doesn't in the second one.
>
> P. S. I use Virtuoso Cloud Edition 06.01.3127
>
> Regards,
> Alexander
>
> 2010/5/18 Hugh Williams <[email protected]>
> Hi Alexander,
>
> Are the LGD queries that worked against the lod.openlinksw.com server giving
> a specific error when you attempt to run against your EC2 AMI with the LGD
> datasets loaded ? Also what is the exact version of the Virtuoso EC2 AMI,
> this will be reported in the left frame of the conductor UI ?
>
> Best Regards
> Hugh Williams
> Professional Services
> OpenLink Software
> Web: http://www.openlinksw.com
> Support: http://support.openlinksw.com
> Forums: http://boards.openlinksw.com/support
> Twitter: http://twitter.com/OpenLink
>
> On 17 May 2010, at 18:04, Alexander Sidorov wrote:
>
>> Hi Kingsley,
>>
>> Yes, geo capabilities work very well under Virtuoso Cloud Edition (good
>> performance was a great surprise after migrating from lod.openlinksw.com to
>> custom Amazon EC2 instance). Here I will quote the initial question to point
>> out the problem:
>>
>> "Prevously I executed LGD queries using lod.openlinksw.com endpoint (where
>> full LGD is loaded). Today I have loaded LGD Elements to my custom Virtuoso
>> instance and all LGD queries became broken. As I have found out "geometry"
>> predicate is absent at LGD Elements dataset. Changing "geometry" to
>> combination of "lat" and "long" solved my problem. But please put the note
>> concerning "geometry" predicate at linkedgeodata.org/datasets page to
>> prevent other people to struggle with this problem."
>>
>> Regards,
>> Alexander
>>
>> 2010/5/17 Kingsley Idehen <[email protected]>
>> Alexander Sidorov wrote:
>> Hi Alex,
>>
>> You are right, geo-capabilities are included only in commercial Virtuoso
>> instances. But it is my case (as I use Virtuoso Cloud Edition). I hope
>> OpenLink guys can clarify this behaviour so I have added virtuoso-users to
>> cc.
>>
>> Cloud Edition is the Commercial Edition so you have SPARQL-GEO and related
>> GeopSpatial index capabilities.
>>
>>
>> Kingsley
>>
>> Regards,
>> Alexander
>>
>> 2010/5/17 Alex Tucker <[email protected] <mailto:[email protected]>>
>>
>> Hi Alexander,
>>
>>
>>
>> I followed the link you provided but haven't found any
>> information concerning "geometry" predicate generation. Could you
>> please point to it? Also it is strange "geometry" predicate is
>> generated at lod.openlinksw.com <http://lod.openlinksw.com> but
>>
>> is not generated at my custom Virtuoso instance.
>>
>> My understanding is that the geometry predicate is computed by
>> Virtuoso and is only available in the commercial edition, not the
>> free open source edition. This explains why you can use it at
>> lod.openlinksw.com <http://lod.openlinksw.com> and potentially at
>>
>> the new LGD servers, as I believe OpenLink donated a commercial
>> license to run the LGD servers too.
>>
>> Alex.
>>
>>
>> ------------------------------------------------------------------------
>>
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>>
>> --
>>
>> Regards,
>>
>> Kingsley Idehen President & CEO OpenLink Software Web:
>> http://www.openlinksw.com
>> Weblog: http://www.openlinksw.com/blog/~kidehen
>> Twitter/Identi.ca: kidehen
>>
>>
>>
>>
>>
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