Quiz SemTech 09

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Semantic Universe sponsors a free full conference ticket for the Semantic Technology conference in San Jose 2009

http://www.semantic-conference.com/

The ticket goes to the person that correctly answers the following question:

How many unique members do the following groups of the Semantic Web Meetup Alliance have combined at 6pm on May 31 2009?

Berlin
Cambridge
Chicago
Dallas
London
Los Angeles
New York
Oslo
San Francisco
Seattle
Toronto
Vancouver
Washington

Please send the answer to marco.neumann@gmail.com on Sunday May 31, 2009 after 6pm

As a little hint you can use the SWNYC RDF wrapper to extract member graphs for each meetup group and use the aggregate function count in SPARQL to find the answer

Berlin http://www.swnyc.org/sparql/?id=1331888
Cambridge http://www.swnyc.org/sparql/?id=1336198
Chicago http://www.swnyc.org/sparql/?id=970635
Dallas http://www.swnyc.org/sparql/?id=1455665
London http://www.swnyc.org/sparql/?id=1462944
Los Angeles http://www.swnyc.org/sparql/?id=1066567
New York http://www.swnyc.org/sparql/?id=274991
Oslo http://www.swnyc.org/sparql/?id=1451939
San Francisco http://www.swnyc.org/sparql/?id=1336642
Seattle http://www.swnyc.org/sparql/?id=1441112
Toronto http://www.swnyc.org/sparql/?id=1414930
Vancouver http://www.swnyc.org/sparql/?id=1429794
Washington http://www.swnyc.org/sparql/?id=987383


And here is a possible SPARQL query 


PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/> 
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX meetup: <http://www.swnyc.org/meetup/>

SELECT count(?x)
#Berlin
FROM <http://www.swnyc.org/sparql/?id=1331888>
#Cambridge
FROM <http://www.swnyc.org/sparql/?id=1336198>
#Chicago
FROM <http://www.swnyc.org/sparql/?id=970635>
#Dallas
FROM <http://www.swnyc.org/sparql/?id=1455665>
#London
FROM <http://www.swnyc.org/sparql/?id=1462944>
#Los Angeles
FROM <http://www.swnyc.org/sparql/?id=1066567>
#New York
FROM <http://www.swnyc.org/sparql/?id=274991>
#Oslo
FROM <http://www.swnyc.org/sparql/?id=1451939>
#San Francisco
FROM <http://www.swnyc.org/sparql/?id=1336642>
#Seattle
FROM <http://www.swnyc.org/sparql/?id=1441112>
#Toronto
FROM <http://www.swnyc.org/sparql/?id=1414930>
#Vancouver
FROM <http://www.swnyc.org/sparql/?id=1429794>
#Washington
FROM <http://www.swnyc.org/sparql/?id=987383>

WHERE{
?x rdf:type foaf:Person.
}
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