Support for BIND(IF(x,y,z) AS ?foo) in SPARQL rules

[Albert Meroño Peñuela]

Hi,

I'm trying to encode some business rules as Stardog SPARQL rules, using the format

eg:myrule a rule:SPARQLRule ;

   rule:content """

       PREFIX eg: <http://example.org/ns#>

       PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

     IF {

       ?foo a eg:bar .

       ?foo eg:myprop ?baz .

       BIND ( IF(?baz = "foobaz", "true"^^xsd:boolean, "false"^^xsd:boolean) AS ?c )

     }

     THEN {

       ?foo eg:myrule ?c

     }

   """.

However, this rule never gets triggered (i.e. the triple ?foo eg:myrule ?c is never generated), unless I replace the IF(x,y,z) statement to something like

BIND ( IF(?baz = "foobaz", ?baz != ?foo, ?foo = ?foo)

Is this well supported in Stardog or am I missing something?

Thanks,

Albert

[Héctor Pérez-Urbina]

Albert,

We recently received a very similar report involving the use of BIND in a rule. We are in the process of deciding whether we will support this or not, as the original intention was for this syntax to be sugar over SWRL (not SPARQL). I will keep you posted.

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Best,
Héctor