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GoodRelations - The Web Vocabulary for E-Commerce

This is the archive of the goodrelations dicussion list

GoodRelations is a standardized vocabulary for product, price, and company data that can (1) be embedded into existing static and dynamic Web pages and that (2) can be processed by other computers. This increases the visibility of your products and services in the latest generation of search engines, recommender systems, and other novel applications.

[goodrelations] goodrelations Digest, Vol 13, Issue 5

Kingsley Idehen kidehen at openlinksw.com
Sat Sep 12 18:38:03 CEST 2009

goodrelations-request at ebusiness-unibw.org wrote:
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> Today's Topics:
>    1. LOC Dataspace, Quering for GoodRelations Data
>       (Martin Hepp (UniBW))
> ----------------------------------------------------------------------
> Message: 1
> Date: Fri, 11 Sep 2009 14:31:04 +0200
> From: "Martin Hepp (UniBW)" <martin.hepp at ebusiness-unibw.org>
> Subject: [goodrelations] LOC Dataspace, Quering for GoodRelations Data
> To: goodrelations at ebusiness-unibw.org
> Message-ID: <4AAA4308.8030506 at ebusiness-unibw.org>
> Content-Type: text/plain; charset="iso-8859-1"
> Dear all:
> As the amount of GoodRelations data is growing, I wanted to stress that 
> you can use the Virtuoso dataspace at
> http://loc.openlinksw.com/sparql
> for queries. We are currently trying to get all available GoodRelations 
> data into that space and keep it up-to-data.
> That means that application developers
> - don't have to crawl the whole Web for relevant RDF
> - can use the powerful parallelization techniques and SPARQL extensions 
> from Virtuoso.
> If you want to give it a try: Simply paste the following query: It lists 
> the first 50 items in the space that cost between 5 and 10 EUR or 7 and 
> 14 USD.
> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
> PREFIX gr:<http://purl.org/goodrelations/v1#>
> SELECT ?s ?p ?c
> ?s a gr:Offering.
> ?s gr:hasPriceSpecification ?ps.
> ?ps gr:hasCurrencyValue ?p.
> ?ps gr:hasCurrency ?c.
> FILTER ((regex(?c, "EUR") && ?p >"5"^^xsd:float && ?p <"10"^^xsd:float) 
> || (regex(?c, "USD") && ?p >"7"^^xsd:float && ?p <"14"^^xsd:float))
> } LIMIT 50
> Also, you can use the next query to watch the growth in instance data. 
> It lists all GoodRelations classes and determines the amount of instances.
> # List of Class Frequency
> SELECT ?class, count(?instance) as ?freq WHERE
>    {
>     ?instance a ?class.
>     {SELECT ?class FROM <http://purl.org/goodrelations/v1#> WHERE
>      {?class a owl:Class. }
>     }
>    }
> Since Virtuoso is a quad store, you can constrain the expressions to 
> individual graphs or graph groups. This is how the previous query 
> constraints the list of classes to those defined in GoodRelations.
> Also, note that Virtuoso supports nesting and subqueries.
> Best wishes
> Martin

Also remember queries like:

PREFIX gr: <http://purl.org/goodrelations/v1#>
PREFIX ceo: 
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

SELECT ?m ?label ?weight ?ean ?zoomfactor (( ?weight / ?zoomfactor )) as 
{?m a ceo:Camcorder.
?m rdfs:label ?label.
?m ceo:hasWeight ?v.
?m ceo:hasDigitalZoomFactor ?z. ?z gr:hasValueInteger ?zoomfactor . 
filter ( ?zoomfactor > 0 ) .
?v gr:hasValueFloat ?weight.
?v gr:hasUnitOfMeasurement "GRM"^^xsd:string.
OPTIONAL {?m gr:hasEAN_UCC-13 ?ean}
ORDER BY DESC  ( ?weight / ?zoomfactor )



Kingsley Idehen	      Weblog: http://www.openlinksw.com/blog/~kidehen
President & CEO 
OpenLink Software     Web: http://www.openlinksw.com

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