Hi Mark,
the spec is indeed ambiguous on this, and my recommendation would be to
use whatever convention the SPIN API uses, because it is very unlikely
that I'd introduce a change that would break deployed SPIN RDF files.
This also makes it easier to generate SPIN RDF triples - just enter them
in TBC and look at the produced source code.
I believe in the original design I was handling aggregations differently
from other projection expressions such as SELECT (1 + 2 AS ?result)
while in fact they should be treated uniformly. The sp:varName solution
does just that and should be preferred over sp:as. I have dropped sp:as
from the spec at spinrdf.org for now.
Thanks for pointing this out!
Holger
On 9/12/2015 19:53, Mark Hale wrote:
Hi all,
In the sp spec http://spinrdf.org/sp.html it mentions using sp:as in
select clauses (section 4.2). There is no example, but it seems like
it would look like this:
[
sp:as [ sp:varName "result"^^xsd:string ] ;
a sp:Count ;
sp:expression [
sp:varName "object"^^xsd:string ;
] ;
]
On the other-hand the spl rdf file makes no use of sp:as and instead
uses an alternative notation:
[
sp:expression [
rdf:type sp:Count ;
sp:expression [
sp:varName "object"^^xsd:string ;
] ;
] ;
sp:varName "result"^^xsd:string ;
]
Which should I be using?
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