What is the {railway bridge} with the {MAX(clearance)} whose {instance of} is {railway bridge}  ?
Of the railroad bridges, which is tallest?
What is the tallest bridge that is also a railroad bridge?
SELECT ?r WHERE { ?r rdf:type ontology:railway_bridge . ?r property:clearance ?e . ?r rdf:type ontology:railway_bridge }
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q1210334>.

?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2793>.
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj1.

?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P31> .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q1210334> .

}
ORDER BY DESC(?obj1)
LIMIT 5
select ?ent where { ?ent wdt:P31 wd:Q1210334 . ?ent wdt:P2793 ?obj . ?ent wdt:P31 wd:Q1210334 } ORDER BY DESC(?obj)LIMIT 5 
Najiehe Railway Bridge Qinglong Railway Bridge Beipan River Shuibai Railway Bridge Yachi Railway Bridge Nanpan River Qiubei Bridge