PREFIX : <http://example.org/ns#>
SELECT *
WHERE
  { 
    { ?s ?p ?o } UNION { {1 <p> 3 } . ?s ?p ?o } UNION { ?s ?p ?o } .
     ?s ?p ?o . 
     ?s ?p ?o . 
     GRAPH ?g { ?s ?p ?o } . FILTER ?o < 5 .
     { ?s ?p ?o . FILTER ?o < 5 . } .
     { FILTER ?o < 5 } .
     ?s ?p ?o . 

  ?id << <foo> ?p ?o >> .
   ?s <foo> ?o .
   FILTER REGEXP(<foo>, "^http://") . # Alt spelling
   FILTER REGEX(?s, "^http://", "i") .
  ( 1 ( 2 3) 4  ) .
  { ?s ?p ?o } .
  
  (1 (33) ?x ) :p :foo .

  ?s ?p ?o . FILTER REGEXP(xsd:string(?o), "XX") . 
  FILTER xsd:integer(?o) .

## Silly but legal

 ( ( ) ) .
  << ?s ?p ?o >> :p "" .
  [ :pp :qq ] .
  ( [ :pp :qq ] ) .
  [ ?x ?y ] :p [ ?a ?b ; ?c ?d ] .
  ( [ ?x ?y ] ) :p ( [ ?pa ?b ] 57 ) .
  [] << ?s ?p ?o >> .
  [ << ?s ?p ?o >> ] .
  ( [ :p () ] ) .
  ( [ << ?s ?p ?o >> ] ) .
  FILTER [] .
  FILTER ?x .
}