Syntax 1:

Braces {} ; nesting ; inline constraints ; no distinction for constrainst


Syntax 2:

Use () for triples; use () for nesting ; constaints introduced by AND (inline? one only?)


Syntax 3:

No inline constriants



Block: Triple Pattern list AND ?x < 34
Conjunction blocks
optional blocks


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Example/s1 ::: Brace
  + Jos, Eric, Yoshio, Andy (4)
  - Dave, Steve, Kendall, Alberto , DirkX
  
SELECT ?name1 ?name2
WHERE
     { ?x foaf:knows ?y .
       ?x foaf:age ?n . ?n < 42 .
       OPTIONAL { ?x foaf:name ?name1 . ?x foaf:age ?n . ?n < 42 . }
       OPTIONAL { ?y foaf:name ?name2 . } 
     } .


SELECT ?name1 ?name2
WHERE
    ( ?x foaf:knows ?y )
    ( ?x foaf:age ?n )
    AND ?n < 42
    OPTIONAL ( ( ?x foaf:name ?name1 ) ( ?x foaf:age ?nn ) AND ?nn < 42 )
    OPTIONAL ( ( ?y foaf:name ?name2 ) )

 + 3-ish
 - AndyS
 
SELECT ?name1 ?name2
WHERE
    ( ?x foaf:knows ?y )
    ( ?x foaf:age ?n )
    OPTIONAL 
      ( ?x foaf:name ?name1 )
      ( ?x foaf:age ?nn ) 
      ?nn + ?n < 42
    OPTIONAL
      ( ?y foaf:name ?name2 )
 



:::Implicit AND
  4 ish
  +KC

SELECT ?name1, ?name2
FROM <D.n3> <E.n3>
WHERE
   (?x foaf:knows ?y)
   (?x foaf:age ?n)
   (?name1 foaf:knows ?name2)
   [?x foaf:name ?name1 ]
   [?x foaf:name ?name2 ]
AND
   ?n < 42
   
   
Explict AND:
 + 1
 - AndyS, Jos, Kendall, DaveB, ??

SELECT ?name1, ?name2
FROM <file:D.n3>, <file:E.n3>
WHERE
   (?x foaf:knows ?y) AND
   (?x foaf:age ?n) AND
   (?name1 foaf:knows ?name2) AND
   [?x foaf:name ?name1 ] AND
   [?x foaf:name ?name2 ] AND
   ?n < 42
   
   
::: nested optionals : explicit AND

SELECT ?name1, ?name2
FROM <D.n3>, <E.n3>
WHERE
   (?x foaf:knows ?y) AND
   (?x foaf:age ?n) AND
   (?name1 foaf:knows ?name2) AND
   ( [ ?x foaf:name ?name1 ] AND
     [ ?x foaf:name ?name2 ] ) AND
   ?n < 42
   
   
::: Implicit AND , nested optional, OPTIONALS by []
  + 5 
  - Jos
  + Alberto, Steve, DaveB
  
   [ ( ?x foaf:name ?name1 ) 
     ( ?x foaf:name ?name2 ) ] 
   
   
::: predicatey - can easier see NOT, OR
  + 2
  - AndyS, Jos

SELECT ?name1, ?name2
FROM <D.n3>, <E.n3>
WHERE
   triple(?x foaf:knows ?y) AND
   triple(?x foaf:age ?n) AND
   triple(?name1 foaf:knows ?name2) AND
   optionaltriple(?x foaf:name ?name1) AND
   optionaltriple(?x foaf:name ?name2) AND