Arthur; So let's say :vertexCoordinates takes an argument (?arg1) and
returns 4 parameters. The magic property definition would look like:
SELECT ?i ?x ?y ?z
WHERE
{ ?arg1 :prop1 ?i
...
}
and the triple pattern would be:
?ngon :vertexCoordinates (?i ?x ?y ?z)
As an example, that anyone on Composer can try out, follow these steps
in the kennedysSPIN file in the TBC library example:
1. Create a subclass of spin:MagicProperties (subclass of
spin:Modules/spin:Functions), name it getNamesOfPerson
2. Create a constraint from the spl:Argument template using sp:arg1
(optionally restrict the valueType to :Person)
3. Place the following query in the spin:body
SELECT ?fname ?lname ?name
WHERE {
?arg1 kennedys:name ?name .
?arg1 kennedys:firstName ?fname .
?arg1 kennedys:lastName ?lname .
}
While in kennedysSPIN execute the following query:
SELECT *
WHERE {
?person a kennedys:Person .
?person kspin:getNamesOfPerson (?first ?last ?full)
}
This will give a result set with ?first, ?last, ?full bound for each
binding to ?person from the first triple pattern (i.e. "?person a
kennedys:Person").
-- Scott
On Jun 10, 1:10 pm, Arthur Keen <[email protected]> wrote:
> For multiple bindings,
>
> SELECT *
> WHERE {
> ?x tops:split ("John Jacob Jingle Ivor Schmidt" " ")
>
> }
>
> parses and successively binds ?x to the tokens in the string.
>
> If there are multiple return values and multiple bindings from the magic
> property, for example (I am making this up on the fly) , if I want to access
> the coordinates of vertex loop of a polygon using a magic property
> :vertexCoordinates that accesses the vertices of the polygon and returns
> their coordinates:
>
> SELECT *
> WHERE {
> ?ngon a :Polygon
> (?i ?x ?y ?z) :vertexCoordinates (?ngon).
>
> } ORDER BY ?i
>
> ?i ?x ?y ?z ?ngon
> 0 1 0 0 p1
> 1 0 1 0 p1
> 2 ...
>
> On Jun 10, 2010, at 12:30 PM, Scott Henninger wrote:
>
> > Arthur; I've always found top:split to be a good example of how this
> > works. Try the following on the kennedys model:
>
> > SELECT *
> > WHERE {
> > ?person kennedys:name ?name .
> > ?x tops:split (?name " ")
> > }
>
> > It's also a god example of what a magic property does. It creates
> > multiple bindings for the variable. I say this because it seems like
> > the example you gave earlier should be applied via SPIN function
> > because it would only generate one binding. Then the syntax would be:
> > LET ?name := apf:concat(?firstName, ?lastName))
>
> > (...or did you mean fn:concat()?)
>
> > -- Scott
>
> > On Jun 10, 12:47 am, Holger Knublauch <[email protected]> wrote:
> >> Yes, this is correct. Furthermore, a magic property can also have multiple
> >> variables on the left side, for each SELECT ?x ?y ?z variable.
>
> >> Syntactically, the (...) is a short notation for RDF lists, BTW.
>
> >> Holger
>
> >> On Jun 10, 2010, at 3:32 PM, Arthur Keen wrote:
>
> >>> In the SPIN documentation, there is a statement "Magic properties can
> >>> also take multiple arguments ..." What is the syntax for passing in the
> >>> other arguments.
> >>> The example ?name apf:concat (?firstName ?lastName), indicates the
> >>> syntax is: object propertyfunction (arg1 arg2), is that right?
>
> >>> Arthur
>
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