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Some constants of important, shared values for the platform

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PREFIX rdf:    
PREFIX uctelco: 
PREFIX geo:    
PREFIX :       

CONSTRUCT {
    :e rdf:type :ContextualizedLatitudeEvent .
    :e :stream .
	:e :location [ geo:lat ?Latitude1; geo:long ?Longitude1 ] .
	:e uctelco:phoneNumber ?bob .
	:e uctelco:phoneNumber ?alice .
    :e :message "Alice and Bob are close to a where someone tweeted." .
}
WHERE {
    CONTEXT ?id1 {
        ?e1 rdf:type :TwitterEvent .
        ?e1 :endTime ?time .
        ?e1 :stream  .
		?e1 :screenName ?someone .
		?e1 :location [ geo:lat ?Latitude1; geo:long ?Longitude1 ] .
    }
    FILTER ?time > (NOW() - xsd:duration("PT120M"))
    WINDOW {
        EVENT ?id2 {
            ?e2 rdf:type :UcTelcoGeoLocation .
            ?e2 :stream  .
			?e2 :location [ geo:lat ?Latitude2; geo:long ?Longitude2 ] .
			?e2 uctelco:phoneNumber ?alice .
            }
			FILTER fn:abs(?Latitude1 - ?Latitude2) < 0.1 && fn:abs(?Longitude1 - ?Longitude2) < 0.5
        SEQ
        EVENT ?id3 {
            ?e3 rdf:type :UcTelcoGeoLocation .
            ?e3 :stream  .
			?e3 :location [ geo:lat ?Latitude3; geo:long ?Longitude3 ] .
			?e3 uctelco:phoneNumber ?bob .
            }
            FILTER fn:abs(?Latitude2 - ?Latitude3) < 0.1 && fn:abs(?Longitude2 - ?Longitude3) < 0.5
				&& ?alice != ?bob
    } ("PT120M"^^xsd:duration, sliding)
}