This is the archive of the goodrelations dicussion list

This may also be interesting for subscribers of this list, in  
particular the query example.

Begin forwarded message:

> Resent-From: semantic-web at w3.org
> From: Martin Hepp <martin.hepp at ebusiness-unibw.org>
> Date: 22. Dezember 2010 18:28:38 MEZ
> To: Semantic Web <semantic-web at w3.org>
> Cc: Bob DuCharme <bob at snee.com>, Hugh Glaser <hg at ecs.soton.ac.uk>
> Subject: Re: a list of companies active in the semantic technology  
> area
>
> Hi all:
>
> Apologies for my late reply, end of term season ;-)
>
> It is very easy to create and maintain such a directory based on  
> GoodRelations - actually, the following should already work pretty  
> well as of today :
>
> 1. A company describes its range of products and services using  
> GoodRelations, e.g. using the GoodRelations   Annotator
>
> http://www.ebusiness-unibw.org/tools/goodrelations-annotator/
>
> Many SW companies have done so already, e.g.
>
> 	http://www.franz.com/goodrelations.rdf
>
> 2. The site informs one or more RDF repositories / crawlers of that  
> data, e.g. sindice.com or Ping The Semantic Web so that they can  
> crawl and collate the data.
>
> 3. Rund a query for matching companies against a suitable SPARQL  
> endpoint
>
> See an example query below. The query may not yet be perfect,  
> because testing them on
>
>   http://loc.openlinksw.com/sparql
>   http://lod.openlinksw.com/sparql
>   http://uriburner.com/sparql
>
> currently yields an error message
>
> "37000 Error SQ156: Internal Optimized compiler error : dt not found  
> based on cname in sqlo.c:1078."
> which I do not understand, so I cannot quickly spot whether it's the  
> query or the endpoint.
>
> The basic pattern would be to
> - search for gr:BusinessEntities
> - that make at least one gr:Offering that is related to semantic  
> technology.
>
> The latter can be expressed - approximately - by
>
> - checking for the words
>
> "semantic", "RDF", "ontolog", "OWL", "triplestore", or "linked data"
>
> - in the textual elements attached to the gr:Offering or
> - the textual elements of a product or product model linked to that  
> offer via gr:includes, and also
> - considering  gr:Offering nodes that include objects that are  
> instances of subclasses of gr:ProductOrService that contain one of  
> these words in the class name, or in its superclasses class names.
>
> Nice example for a typical hybrid SPARQL query in a real world  
> setting ;-)
>
> Best
>
> Martin
>
>
> # List all companies that sell/lease/maintain etc. semantic technology
>
> SELECT ?c ?page ?legalname WHERE
> {
>  ?c a gr:BusinessEntity .
>  ?c gr:legalName ?legalname .
>  OPTIONAL { ?c foaf:page ?page }
>  ?c gr:offers ?o .
>
> # Now we have to check that they sell something "semantic"
> # Option 1: The offering contains "semantic", "RDF", "ontolog",  
> "OWL", "triplestore", or "linked data"
>  {
> 	{ ?o ?textprop ?text . }
> 	UNION
> # Option 2: The product or product class contains one of those words
> 	{
> 	  {
>  		{ ?o gr:includes ?product. }
>   		UNION
> 	  	{ ?o gr:includesObject ?t .
> 	  	  ?t a gr:TypeAndQuantityNode .
> 	  	  ?t gr:typeOfGood ?product .
> 	    }
> # The UNION pattern above is because we cannot assume that the  
> expansion of gr:includes is materialized in triples
> # See http://www.ebusiness-unibw.org/wiki/GoodRelationsOptionalAxiomsAndLinks 
> 	
> 	  }
> # Option 2a: The product contains one of those words
> 	  ?product ?textprop ?text .
> # Option 2b: The product is an instance of a class that contains  
> those words in their name
> 	  ?product a ?class .
> 	  ?class rdfs:subClassOf gr:ProductOrService .
> 	  ?class ?textprop ?text .
> # Also consider labels of superclasses	
> 	  OPTIONAL {
>  	    		?class rdfs:subClassOf ?superclass .
>  		    	?superclass ?textprop ?text .}	
> 	}
>  }
> # Constrain the relevant text properties
>  FILTER (?textprop = rdfs:label || ?textprop = rdfs:comment || ? 
> textprop = gr:name || ?textprop = gr:description )
> # Check for significant words
>  FILTER ( bif:contains(?text, "semantic") || bif:contains(?text,  
> "RDF") ||
>  	bif:contains(?text, "ontolog") || bif:contains(?text, "OWL") ||  
> bif:contains(?text, "triplestore") ||
>  	bif:contains(?text, "linked data") )
> }
> LIMIT 10
>
>

--------------------------------------------------------
martin hepp
e-business & web science research group
universitaet der bundeswehr muenchen

e-mail:  hepp at ebusiness-unibw.org
phone:   +49-(0)89-6004-4217
fax:     +49-(0)89-6004-4620
www:     http://www.unibw.de/ebusiness/ (group)
          http://www.heppnetz.de/ (personal)
skype:   mfhepp
twitter: mfhepp

Check out GoodRelations for E-Commerce on the Web of Linked Data!
=================================================================
* Project Main Page: http://purl.org/goodrelations/
* Quickstart Guide for Developers: http://bit.ly/quickstart4gr
* Vocabulary Reference: http://purl.org/goodrelations/v1
* Developer's Wiki: http://www.ebusiness-unibw.org/wiki/GoodRelations
* Examples: http://bit.ly/cookbook4gr
* Presentations: http://bit.ly/grtalks
* Videos: http://bit.ly/grvideos