PREFIX dbo: 

SELECT ?name ?birth ?description ?person WHERE {
     ?person dbo:birthPlace :Stockholm.
     ?person  .
     ?person dbo:birthDate ?birth .
     ?person foaf:name ?name .
     ?person rdfs:comment ?description .
     FILTER (?birth < "1900-01-01"^^xsd:date).
     FILTER (LANG(?description) = 'en') .
}
ORDER BY ?name

PREFIX geo:  
PREFIX onto:  
SELECT * WHERE {
 ?s a onto:Place .
 ?s geo:lat ?lat .
 ?s geo:long ?long .
 FILTER(
  xsd:double(?lat) - xsd:double(59.3294) <= 2 && 	   xsd:double(59.3294) - xsd:double(?lat) <= 2 &&  xsd:double(?long) - xsd:double(18.0686) <= 2 && 	  xsd:double(18.0686) - xsd:double(?long) <= 2).
}
LIMIT 100

http ://dbpedia.org/snorql/

SELECT *
WHERE{
  ?country rdf:type wi-onto:Country.
  ?country rdfs:label ?label.
  FILTER (lang(?label) = 'en').  
  ?country skos:prefLabel ?countryLabel.
  FILTER (lang(?countryLabel) = 'zh').  
  ?country wi-onto:has-iso-alpha3-code ?id.
  ?country geo:lat ?lat.
  ?country geo:long ?long.
  }

http://data.webfoundation.org/snorql

• Based on graph-patterns
  
• Define the query base through the property
• oslc.queryBase
• Two patterns matching
• Property Tree patterns
• Configuration oslc.properties
• Member List patterns
• At least one of:

 oslc.where, oslc.searchTerms, oslc.orderBy, and oslc.select

• Give me the bugs with identifier 4242

 http://example.com/bugs?oslc.where=dcterms:identifier="4242“

• Give me the bugs with "high priority" created after April 2010  

http://example.com/bugs?oslc.where=cm:severity="high" and dcterms:created>"2010-04-01“  

• Give me the bugs created by "Jhon Smith"  

 http://example.com/bugs?oslc.where=dcterms:creator{foaf:givenName="John" and foaf:familyName="Smith"}

• A restricted syntax of SPARQL
• Triple matching in SPARQL will be automatic
• The endpoint receives the query and returns the set of results
• No API is required (hard-wired)
• More intuitive (a Linked Data principle)
• Content negotiation

• It is necessary to deploy an endpoint?
• Security->SPARQL injection?
• Simplicity
• Use graph patterns but no dependency to SPARQL

Discusion

• http://open-services.net/resources/tutorials/oslc-primer/query-mechanisms/
  

• A SPARQL interface helps to query Linked Data
• It is not mandatory to deploy a RDF repository
• ...offer the logical interface
• SPARQL as a language can be translated to SQL, etc.
• More simple and intuitive
• Key-driver for Linked Data

but...

As a logical view or interface (at least)…

• Speaker: Dr. Jose María Alvarez-Rodríguez
• Carlos III University of Madrid, Spain
• Member of the OSLC RM working group
• E-mail: josemaria.alvarez@uc3m.es
• WWW: 
• http://purl.org/krgroup/web
• http://www.josemalvarez.es
• Team:
• KR group
• Prof. Dr. Juan Llorens
• Prof. Dr. Juan Migel Gómez, 
• Dr. Anabel Fraga
• Dr. Valentín Moreno
• Ms. Manuela Alejandres
• Mr. Jose Fuentes (The ReuseCompany Inc.)