what is the {of} for {photon} has {mass} as {0.0} ?
Why did the Photon weight become 0?
what is the Photon weight become 0.0?
SELECT ?u WHERE { ?a property:mass ?p . FILTER ( CONTAINS ( ?p , '0.0' ) ) . ?a property:of ?u . resource:photon property:mass ?a }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q3198> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2067> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <0.0> .
?statement <http://www.wikidata.org/entity/P642> ?value. 
} 

SELECT ?value WHERE { wd:Q3198 p:P2067 ?s . ?s ps:P2067 ?x filter(contains(?x , '0.0')) . ?s pq:P642 ?value}