base <http://www.inrialpes.fr/exmo/>
prefix ex: <http://www.example.com/> 
prefix foaf: <http://xmlns.com/foaf/0.1/>  
prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>  

select distinct ?x ?y ?z 
from named <G1.ttl> 
from ex:G2.ttl
from <http://example.org/sparql/>   
where {
  {
    ?x rdf:type ex:city .  
    ?y $y ?z .  
  }
  { 
    { 
      (?s1 [?p1 ?o1] ?s2) ?p2 ?o2 ;;;;
			  ?p3 ?o3 , ?o4 , ?o5 .  
    }
    UNION
    { 
      ?x ex:name "hey I'm typed"^^<http://example.net/mydatatype> .  
    }
    OPTIONAL
    { 
      $var1 ex:name $y .
      $var2 ex:name $y .
      $var2 ex:depicts _:blank .  
    }
	GRAPH ?x
    {
      <foaf:uri1> ?p4 ex:ex .
	  <http://example.net/zzz> ex:prop :zimmer
    }
	FILTER (?z = 4 + ex:mou/10 - <http://myfunction.com>(?arg1,?arg2))
  }
}               
order by desc(?z)