FILTER NOT EXISTS not supported?

[Alberto Simoes]

Hello

I know SPARQL 1.1 Update is not fully implemented. But it might be implemented and I just not knowing how to use, or it might be easy to implement or fix.
Or, probably, there is another way to obtain the same behavior.

This query:

     PREFIX w: <http://dicionario-aberto.net/rdf/w#>
     PREFIX r: <http://dicionario-aberto.net/rdf/r#>

     WITH <http://dicionario-aberto.net/rdf/>
     INSERT { ?x r:SYN ?y }
     WHERE {
        ?y r:SYN ?x.
        FILTER NOT EXISTS { ?x r:SYN ?y }
     }

The idea is to add inverse relations (in this case, reflexive), just in case they do not exist.

Before trying it I tried with construct:

     PREFIX w: <http://dicionario-aberto.net/rdf/w#>
     PREFIX r: <http://dicionario-aberto.net/rdf/r#>

     CONSTRUCT { ?x r:SYN ?y }
     WHERE {
        ?y r:SYN ?x.
        FILTER NOT EXISTS { ?x r:SYN ?y }
     }

But I get:

   parser error: syntax error, unexpected NOT on line 7

Any hint?

Thank you
Alberto

[Steve Harris]

Use MINUS instead of FILTER NOT EXISTS.

You need a recent 4store, and recent rasqal though.

- Steve

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Steve Harris

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[Alberto Simões]

Hello

Will try with MINUS. I confess I've read the standard, but wasn't able to really understand the difference :-)

Using 4store-git-head, but latest release of rasqal.

Will report soon.

Thanks

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Alberto Simões

[Steve Harris]

The difference is *extremely* subtle to the end user, but for complex reasons MINUS is both easier to implement, and much more efficient in 4store.

- Steve

[Andrew Frank]

i appreciated the answer to this post and it would be EXTREMELY helpful if 4store would post on their page which parts of SPARQL 1.1 are implemented and which not. I do not have a problem with using MINUS, except for the loss of time till i found the answer here.

andrew