Re: SPARQL Evaluation Model

Miguel,

Yes, I have not read through the spec but I will try to do that. 
Ideally, I'd love to see a book that describes the behavior with examples.

Thanks,
Tim

On 3/27/23 08:45, Miguel wrote:
> Hello Tim,
> the reference document is the W3C recommendation [1].
> The semantics of SPARQL are formally defined in two steps: first 
> transforming a textual SPARQL query to a "SPARQL algebra expression", 
> then applying the operational semantics defined on the SPARQL algebra.
> From the transformation step (specifically the part in [2]) comes the 
> fact, often surprising to newcomers, that the order in which clauses 
> are used in a query is indeed important and that some operators are 
> applied incrementally on the pattern defined "above" them.
>
> Cheers,
> Miguel
>
> [1] https://www.w3.org/TR/sparql11-query/
> [2] https://www.w3.org/TR/sparql11-query/#sparqlTranslateGraphPatterns
>
> On Mon, Mar 27, 2023 at 1:51 PM Tim McIver <tim@timmciver.com> wrote:
>
>     Hello,
>
>     Where can I find information about SPARQL's evaluation model? 
>     I've read most of "Learning SPARQL" but I've encountered several
>     surprising results from queries that I've written from what I've
>     learned there.  One of these surprises prompted this question
>     <https://lists.w3.org/Archives/Public/public-sparql-dev/2023JanMar/0011.html>
>     on this mailing list which made me realize that I actually don't
>     understand SPARQL's evaluation model at all and I can't seem to
>     find anything written about it.  I don't believe "Learning SPARQL"
>     discussed the effect that, for example, moving a BIND call would
>     have on the results (if I'm mistaken, please let me know where the
>     book discusses this).
>
>     Thanks,
>     Tim
>