- From: Holger Knublauch <holger@topquadrant.com>
- Date: Thu, 11 Jun 2015 11:11:24 +1000
- To: RDF Data Shapes Working Group <public-data-shapes-wg@w3.org>
I would like to write down the solution to the recursion issue that I
have currently implemented in my prototype, and welcome comments whether
this would resolve the issue.
Recursive evaluation of shapes can only be triggered via the sh:hasShape
function. sh:hasShape takes three arguments:
sh:hasShape(?focusNode, ?shape, ?shapesGraph)
Proposal: sh:hasShape must fail with a constraint violation, if it
encounters a recursive call involving the same combination of arguments.
The constraint violation could have a system generated message such as
"Failed to evaluate constraint due to unsupported recursive use of
sh:hasShape" and point at the focus node that was visited twice.
This would still allow most interesting cases that involve recursion
between shapes, but excludes cases where the same instances are visited
more than once.
What am I missing?
Thanks,
Holger
Received on Thursday, 11 June 2015 01:13:35 UTC