# This query is a quick test of syntax.
# Its doesn'e actually do anything.

PREFIX foaf:    <http://xmlns.com/foaf/0.1/>
PREFIX :        <http://example.org/>
PREFIX ns:      <http://example.org/ns#>

SELECT DISTINCT ?name1 ?name2
FROM <file:D.n3> <http://www.hpl.hp.com/semweb> 
WHERE
{
	// basic triples.
	?x ?y ?z .
	?x :p ?z .
	?x <urn:uri> ?z .
	
	// Groups.
	{	
      ?x ?y ?z .
	  ?x :p ?z .
      ?x <urn:uri> ?z .
    } .

    // Constaints
    ?z < 2 .
    ?z <2 .
    ?z <ns:foo .   // Might look like a URI
    ?z eq ?y .
    (?z < 2) .
    
    // Optional
    
    OPTIONAL { ?a ?b ?c } .
    OPTIONAL { ?a ?b ?c . [ ?d ?e ?f ] . :a :b ?C } .

    [ ?a ?b ?c ] .
    [ ?a ?b ?c . [ ?d ?e ?f ] . [ :a :b ?C ] ] .

	// GRAPH
    GRAPH <file:D.n3>
    {  ?x foaf:knows ?y .
       ?x foaf:name ?name1 .
       ?y foaf:name ?name2 . 
     } .

    GRAPH * { ?x ?y ?z . ?x :p ?z . } .
     
	// Disjunction
	
	{ :a :b :c . } OR { :a :b :d . } .
    //{ { :a :b :c } OR { :a :b :d } } .
    { { :a :b :c } OR { :a :b :d } OR { :a :b :e } } .
}
LIMIT 10