what river measures at less than 23.0 as a mean depth?
Entity
m.027vrk9
Guaíba River
class literal
geography.river 23.0^^http://www.w3.org/2001/XMLSchema#float
geography.river type.float
River 23.0
none <
geography.body_of_water.mean_depth
Mean depth
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :geography.river . 
FILTER (?x1 < "23.0"^^<http://www.w3.org/2001/XMLSchema#float>)
?x0 :geography.body_of_water.mean_depth ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND geography.river (lt geography.body_of_water.mean_depth 23.0^^http://www.w3.org/2001/XMLSchema#float))