Re: [Dbpedia-discussion] DBPedia SPARQL query poblems
Mariana, you got too many answers already, but here's another :-) It's a precaution: Wikipedia categories are a navigational aid, and can't be used reliably to find things of a certain kind. E.g. these two results of the query are not Platforms: - http://dbpedia.org/page/IBM/Google_Cloud_Computing_University_Initiative: is an initiative - http://dbpedia.org/page/TradeCard: is a company http://dbpedia.org/c/9CH4UXVL -- shortened version of the above Kingsley, how do you get this? -- Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net ___ Dbpedia-discussion mailing list Dbpedia-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
Re: [Dbpedia-discussion] DBPedia SPARQL query poblems
On 1/9/15 1:02 PM, Vladimir Alexiev wrote: Mariana, you got too many answers already, but here's another:-) It's a precaution: Wikipedia categories are a navigational aid, and can't be used reliably to find things of a certain kind. E.g. these two results of the query are not Platforms: -http://dbpedia.org/page/IBM/Google_Cloud_Computing_University_Initiative: is an initiative -http://dbpedia.org/page/TradeCard: is a company http://dbpedia.org/c/9CH4UXVL -- shortened version of the above Kingsley, how do you get this? Vladmir, I suspect you mean, how does one solve this problem? If so, here goes: 1. If you want to stick with generation of the list a SPARQL query that targets DBpedia, you have to apply a FILTER based on your known knowledge (e.g., what you've pointed out above) 2. You can use a CONSTRUCT to perform an export into your own data space which becomes you base for maintaining a list of cloud services providers -- you can then enhance this list with your domain knowledge and then hopefully publish back to the LOD cloud (in some cases, you can send it back to us and we'll even load into its own named graph etc..). -- Regards, Kingsley Idehen Founder CEO OpenLink Software Company Web: http://www.openlinksw.com Personal Weblog 1: http://kidehen.blogspot.com Personal Weblog 2: http://www.openlinksw.com/blog/~kidehen Twitter Profile: https://twitter.com/kidehen Google+ Profile: https://plus.google.com/+KingsleyIdehen/about LinkedIn Profile: http://www.linkedin.com/in/kidehen Personal WebID: http://kingsley.idehen.net/dataspace/person/kidehen#this smime.p7s Description: S/MIME Cryptographic Signature -- Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net___ Dbpedia-discussion mailing list Dbpedia-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion
[Dbpedia-discussion] DBPedia SPARQL query poblems
Dear dbpedians,
I'm new with sparql and I'm trying to learn it with DBPedia.
I want to query i.e. all cloud service platforms from the side:
http://dbpedia.org/page/Category:Cloud_platforms
and this is the query I use for that in dbpedia snorql:
PREFIX dcterms: http://purl.org/dc/terms/
SELECT ?platform
WHERE {
{ http://dbpedia.org/resource/Category:Cloud_platforms dcterms:subject
?platform.
}
I will appriciate your suggestions and ideas.
Thank you very much for your support in advanced!
My very best
Marianna
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Re: [Dbpedia-discussion] DBPedia SPARQL query poblems
Hi Mariana,
The subject relation should be inverted in your query for the results
you are looking for:
PREFIX dcterms: http://purl.org/dc/terms/
SELECT ?platform
WHERE {
?platform dcterms:subject
http://dbpedia.org/resource/Category:Cloud_platforms.
}
The categories are part of a SKOS ConceptScheme and are always used as
/object/ in a triple expressing a subject relation.
hth, cheers
Roland
On 08-01-15 19:53, Mariana Chukanska wrote:
Dear dbpedians,
I'm new with sparql and I'm trying to learn it with DBPedia.
I want to query i.e. all cloud service platforms from the side:
http://dbpedia.org/page/Category:Cloud_platforms
and this is the query I use for that in dbpedia snorql:
PREFIX dcterms: http://purl.org/dc/terms/
SELECT ?platform
WHERE {
{ http://dbpedia.org/resource/Category:Cloud_platforms
dcterms:subject ?platform.
}
I will appriciate your suggestions and ideas.
Thank you very much for your support in advanced!
My very best
Marianna
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Re: [Dbpedia-discussion] DBPedia SPARQL query poblems
Try this... I believe you have the order reversed...the items it appears you
are looking for have the cloud platform as their screens:subject:
PREFIX dcterms: http://purl.org/dc/terms/
SELECT DISTINCT ?platform
WHERE {
{ ?platform dcterms:subject
http://dbpedia.org/resource/Category:Cloud_platforms .
}
Aaron
On Jan 8, 2015, at 13:53, Mariana Chukanska m.chukan...@googlemail.com
wrote:
Dear dbpedians,
I'm new with sparql and I'm trying to learn it with DBPedia.
I want to query i.e. all cloud service platforms from the side:
http://dbpedia.org/page/Category:Cloud_platforms
and this is the query I use for that in dbpedia snorql:
PREFIX dcterms: http://purl.org/dc/terms/
SELECT ?platform
WHERE {
{ http://dbpedia.org/resource/Category:Cloud_platforms dcterms:subject
?platform.
}
I will appriciate your suggestions and ideas.
Thank you very much for your support in advanced!
My very best
Marianna
--
Dive into the World of Parallel Programming! The Go Parallel Website,
sponsored by Intel and developed in partnership with Slashdot Media, is your
hub for all things parallel software development, from weekly thought
leadership blogs to news, videos, case studies, tutorials and more. Take a
look and join the conversation now. http://goparallel.sourceforge.net
___
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hub for all things parallel software development, from weekly thought
leadership blogs to news, videos, case studies, tutorials and more. Take a
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Re: [Dbpedia-discussion] DBPedia SPARQL query poblems
On 1/8/15 1:53 PM, Mariana Chukanska wrote:
Dear dbpedians,
I'm new with sparql and I'm trying to learn it with DBPedia.
I want to query i.e. all cloud service platforms from the side:
http://dbpedia.org/page/Category:Cloud_platforms
and this is the query I use for that in dbpedia snorql:
PREFIX dcterms: http://purl.org/dc/terms/
SELECT ?platform
WHERE {
{ http://dbpedia.org/resource/Category:Cloud_platforms
dcterms:subject ?platform.
}
I will appriciate your suggestions and ideas.
Thank you very much for your support in advanced!
My very best
Marianna
Mairanna,
A powerful feature of SPARQL is that it includes the SPARQL Protocol
which enables the use of HTTP URIs to identify SPARQL Query Results. In
addition, we have an enhancement to the basic SPARQL Protocol URL
pattern that enables you substitute the query parameter with qtxt,
should the recipient of a query results URL want to look at the actual
query definition.
Step-by Guide:
1. You are interested in what
http://dbpedia.org/resource/Category:Cloud_platforms identifies
2. You can also obtain a different presentation of what the URI above
identifies via
http://dbpedia.org/describe/?uri=http://dbpedia.org/resource/Category:Cloud_platforms
3.
http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.orgquery=SELECT+%3Fplatform%0D%0AWHERE+%7B%0D%0A%3Fplatform%0D%0Adcterms%3Asubject+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FCategory%3ACloud_platforms%3E+.%0D%0A++%7D%0D%0Aformat=text%2Fhtmltimeout=3debug=on
-- Query Results Page for all the platforms
4. http://dbpedia.org/c/9CH4UXVL -- shortened version of the above
5.
http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org*qtxt*=SELECT+%3Fplatform%0D%0AWHERE+%7B%0D%0A%3Fplatform%0D%0Adcterms%3Asubject+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FCategory%3ACloud_platforms%3E+.%0D%0A++%7D%0D%0Aformat=text%2Fhtmltimeout=3debug=on
-- Query Definition Page (remember: qtxt is used instead of query)
Note:
http://dbpedia.org/resource/Category:Cloud_platforms is the object
(not subject) of the dcterms:subject relation. Even though at first
blush it appears to be the opposite since the is ... of surrounding
the dcterms:subject relation's meaning isn't always clear. Basically,
is of is used as alleviation to quirks in RDF the lead to data
being created using triples that take the form:
http://dbpedia.org/resource/Category:Cloud_platforms dcterms:subject
http://dbpedia.org/resource/Amazon_Web_Services
...
Because not everyone supports syntax sugar (e.g., what N3 offers) of the
form:
http://dbpedia.org/resource/Amazon_Web_Services is dcterms:subject of
http://dbpedia.org/resource/Category:Cloud_platforms .
Anyway, we support the aforementioned N3 syntax sugar too.
Hope this helps.
--
Regards,
Kingsley Idehen
Founder CEO
OpenLink Software
Company Web: http://www.openlinksw.com
Personal Weblog 1: http://kidehen.blogspot.com
Personal Weblog 2: http://www.openlinksw.com/blog/~kidehen
Twitter Profile: https://twitter.com/kidehen
Google+ Profile: https://plus.google.com/+KingsleyIdehen/about
LinkedIn Profile: http://www.linkedin.com/in/kidehen
Personal WebID: http://kingsley.idehen.net/dataspace/person/kidehen#this
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Re: [Dbpedia-discussion] DBPedia SPARQL query poblems
Hi Mariana -
For one thing, you have one two many {'s :-)
Also, since 'Cloud platforms' is itself a category, the pertinent
relation is http://www.w3.org/2004/02/skos/core#broader
dcterms:subject only applies between instances and their categories.
Good luck!
- Eric
On 01/08/2015 10:53 AM, Mariana Chukanska wrote:
Dear dbpedians,
I'm new with sparql and I'm trying to learn it with DBPedia.
I want to query i.e. all cloud service platforms from the side:
http://dbpedia.org/page/Category:Cloud_platforms
and this is the query I use for that in dbpedia snorql:
PREFIX dcterms: http://purl.org/dc/terms/
SELECT ?platform
WHERE {
{ http://dbpedia.org/resource/Category:Cloud_platforms
dcterms:subject ?platform.
}
I will appriciate your suggestions and ideas.
Thank you very much for your support in advanced!
My very best
Marianna
--
Dive into the World of Parallel Programming! The Go Parallel Website,
sponsored by Intel and developed in partnership with Slashdot Media, is your
hub for all things parallel software development, from weekly thought
leadership blogs to news, videos, case studies, tutorials and more. Take a
look and join the conversation now. http://goparallel.sourceforge.net
___
Dbpedia-discussion mailing list
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sponsored by Intel and developed in partnership with Slashdot Media, is your
hub for all things parallel software development, from weekly thought
leadership blogs to news, videos, case studies, tutorials and more. Take a
look and join the conversation now. http://goparallel.sourceforge.net___
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